Where Your First Run Actually Dies (Hint: Not at the Boss)
Your first run usually dies around floor 8 or 9 of Act 1, in a normal fight you were supposed to win. A Mawler roars for 3 Vulnerable, follows up with a 14-damage Tear, and your starter deck answers with five points of Block and a prayer. Or a Fossil Stalker lands one unblocked bite, its Suck stacks convert that leak into +3 Strength, and two turns later the fight is beyond saving. These losses have nothing to do with luck. The starter deck kills too slowly, every normal fight leaks health, and by floor 9 the health bar can no longer pay for the elite you pathed into.
Everything below is written for the current Early Access build, v0.111 beta (September 2026), and assumes you have never touched the first Slay the Spire. If you have played it, unlearn three reflexes immediately: there are no boss relics to draft between acts (Ancients and their Blessings replaced them), Defect no longer stacks Focus permanently, and Curses were replaced by Afflictions that latch onto cards you already own and cannot be removed at shops. Old instincts are not neutral here, they are actively misleading.
The first skill is simply knowing which act you are in. Act 1 rolls randomly between two variants, Overgrowth (overgrown ruins) and Underdocks (sewer docks), and each has its own enemies, events and boss pool. The difference is not cosmetic. Skulking Colony, an Underdocks elite, caps the damage it takes per hit, which invalidates any single-big-hit plan the moment you see it. Check the act banner the second a run starts, then plan your route and your card picks around that specific pool.
The second skill is reading the intent icon above every enemy, every turn. Combat in this game is fully telegraphed, and bosses run fixed loops you can learn. Nibbit, a common Overgrowth normal with 42 to 46 HP, cycles a 12-damage ram, a 6-damage swipe that comes with Block, and a Hiss that grants it +2 Strength. Knowing that loop turns the fight into rhythm: block the ram, attack freely into the swipe, and kill the thing before the Hisses stack up. In pairs, their loops stagger, so focus one down first.
The third mental shift is the one that actually produces first wins: treat HP as currency, not as a score. You spend it on elites to buy relics, on events to buy upgrades, and on mistakes as tax. A winning run is mostly the discipline of paying as little as possible in normal fights, so the health bar can afford the two or three purchases that matter. The rest of this guide walks that idea through the entire climb, from the unlock chain to a checklist you run before the final boss.
The Unlock Chain: Which of the Five Heroes to Play First, Second and Last
Five heroes exist in v0.111 and four of them are locked at the start. The chain is mechanical and forgiving: The Ironclad is available immediately. Starting a run as The Ironclad unlocks The Silent. Starting a run as The Silent unlocks The Regent. Starting a run as The Regent unlocks The Necrobinder. Starting a run as The Necrobinder unlocks The Defect. Note the wording: starting a run is enough, you do not need to win, so four deliberately quick abandoned runs can open the full roster in one sitting if you want to shop around.
Playing them in that order is not the best learning order, though. Start with The Ironclad regardless of your background. His 80 HP is the highest on the roster, and his starter relic Burning Blood heals 6 HP after every combat, which forgives the damage every new player leaks. More importantly, his kit teaches four core systems at once: Strength stacking, the Vulnerable debuff (a full archetype in this game, not a footnote), Exhaust synergies, and self-damage payoffs. Bash applying Vulnerable into cheap attacks is the single clearest lesson in how damage multiplication works.
Second, The Silent (70 HP, Ring of the Snake drawing extra cards at combat start). Her Poison, Shiv and discard packages teach attrition and setup, and her Neutralize is, per our card database, the strongest starter card in the game: 0-cost damage plus Weak every single fight. Her new StS2 keyword, Sly, makes certain cards play themselves for free when discarded, the highest single-turn damage ceiling in the game and a wonderful preview of what engine decks feel like.
Here the unlock chain and the recommended learning order split. The chain hands you The Regent third, but community consensus (and our beginner FAQ) suggests saving him for last, because his dual resources, Stars and Forge, punish undisciplined drafting brutally. Take The Necrobinder fourth and The Defect fifth instead. The Necrobinder (66 HP, Bound Phylactery summoning 1 every turn) fights beside Osty, a giant skeletal hand that attacks on command and body-blocks hits, while Doom stacks execute enemies at turn end once they reach their max HP threshold. The Defect (75 HP, Cracked Core channeling 1 Lightning) is the orb character, and after the Focus rework his play is active channel-and-evoke rather than passive scaling, with the 0-cost Claw archetype providing some of the fastest kills in the game.
The Regent (72 HP, Divine Right granting 3 Stars at combat start) is a magnificent machine with one iron rule: Stars persist between turns with no cap, Forge permanently empowers his Sovereign Blade, and you never, ever mix Star cards and Forge cards in one deck because they dilute each other. Save him until drafting discipline is second nature, then enjoy the best burst turns in the game.
Floors 1 to 4: Convert Easy Fights Into Gold and Damage Cards
The job of the first four floors never changes: beat normal enemies, bank gold, and leave with one or two damage cards you did not have before. Act 1 normals are gentle by design (Nibbit sits at 42 to 46 HP, Fossil Stalker at 51 to 53, Haunted Ship at 63, Mawler at 72), but they punish passive play, because every extra turn a fight lasts is 6 to 14 HP walking out of your bar. Front-loaded damage pays twice: it shortens fights now, and it is what lets you kill an elite later.
Read reward screens with this shopping list per character. On Ironclad, Anger is a 0-cost attack that fills out your five-card hand for free, and Pommel Strike is damage plus draw (upgraded, it draws twice). On Silent you already own Neutralize, so look for Blade Dance to add Shivs to your hand, or Backstab for 0-cost burst. On Regent, Astral Pulse spends 3 Stars for 14 damage to all enemies and is honestly one of the strongest commons in the game, while Solar Strike gives 9 damage plus Star income in one card. On Necrobinder, Scourge applies 13 Doom and draws a card, so it never costs you tempo, and Reave deals damage while shuffling a Soul into your draw pile. On Defect, Ball Lightning (7 damage plus a channeled Lightning) and Cold Snap (damage plus a Frost orb) are the workhorses.
A patch note worth internalizing: since v0.101, floor 6 no longer spawns elites. Early paths are much safer than they were at Early Access launch, which means the greedy floor 1 through 6 line of combat, combat, event, combat is nearly free. Your first elite decision therefore lands with a full set of picks behind it instead of a half-built deck.
Practice intent reading on the two best teachers in Act 1. Haunted Ship rams for 10 and shoves 2 Wounds into your deck on turn 1, then Haunts on turn 2 with Weak, Vulnerable and Frail but zero damage. The correct play is obvious once you read it: survive turn 1, then dump your entire hand into it on turn 2. Fossil Stalker teaches the opposite lesson, patience: every unblocked hit grants it +3 Strength through Suck, so Block every single attack even if it means attacking less.
Handle early potions the same way. You have three potion slots, and a Block Potion drunk before a telegraphed 14-damage Tear is worth more than the same potion imagined against some future boss. Hoarding is the beginner tax; our potion guide covers the full timing table, but the short version is that potions exist to save real HP in real fights.
Ironclad players get one bonus: Burning Blood heals 6 after each combat, which usually makes the first campfire an upgrade, not a nap. Everyone else should rest only if a fight genuinely threatened them.
Act 1 Rhythm in Both Variants: Overgrowth and Underdocks
Act 1 asks the same question in both variants: can you build enough damage to race things? Overgrowth phrases it through scaling enemies, Underdocks through mechanics that tax your deck shape.
Overgrowth elites are Bygone Effigy (127 HP), Byrdonis (91) and Phrog Parasite (around 61). The Effigy cycles between asleep and awakened, and the sleep phase is your free setup window: play your Powers, bank your resources, then hold Block for the wake-up turn. Byrdonis alternates Dive and Peck, steady mid-range damage that bleeds you slowly, so apply Weak on its Peck turns and race it down. Phrog Parasite alternates Infect (3 Infection statuses into your discard pile) with a multi-hit Lash, and on death it triggers Infested, spawning 4 Wrigglers that are stunned on their first turn. Save your AoE for that second phase and the fight is a gift.
Overgrowth bosses are a three-way roll. Vantom (173 HP) opens with 9 stacks of Slippery, so every hit you land deals 1 damage; strip the stacks with cheap multi-hit attacks, fully block turn 3 (its 25-plus killer swing), and exploit turn 4 when it self-buffs. The Kin (190 HP plus two acolytes in the high 50s) wants you to focus the low-HP acolytes before the priest in the back. Ceremonial Beast (252) gains +2 Strength every turn, making it a pure DPS race, and below 150 HP it staggers into Ringing, where you may only play 1 card per turn: control the threshold so Ringing catches it nearly dead, then play only your best card each turn.
Underdocks swaps the pool. Skulking Colony (79) caps damage per hit, hard-countering single-big-hit decks like a Forge-built Sovereign Blade; multi-hit attacks and damage over time (Poison, Doom) bypass the cap. Terror Eel (140) is the beefiest Act 1 elite and simply tests whether you can keep blocking for ten turns. Phantasmal Gardener is four small bodies with Skittish 6, meaning the first hit each turn grants them Block, so multi-hit decks feed them: kill one at a time with single big hits, prioritizing whichever is closest to its Enlarge.
Underdocks bosses reshuffle the quiz. Waterfall Giant (240) accumulates Steam Eruption stacks, goes invulnerable at 0 HP, and self-destructs next turn for damage equal to its stacks; save your best Block and potions for the explosion turn, remember that Weak does not reduce the blast, and know that a Doom execute that kills it at 0 stacks skips the explosion entirely. Soul Fysh (211) stuffs Beckon statuses into your deck, 1-cost cards that deal 6 unblockable damage if left unplayed, so pack discard or exhaust answers and defend during its Intangible turns 4 and 5. Lagavulin Matriarch (222) starts asleep and gets worse the longer the fight drags, so slow decks should set up fast.
The rhythm to aim for in either variant: three or four normal fights, your first elite with a rest site before it, a shop visit around the middle floors for a card removal, a second elite only while above roughly 60% HP, and a final campfire before the boss.
Act 2, The Hive: The Litmus Test for Your Build
Act 2 is where runs go to be graded. Elite health jumps hard (the Infested Prism gatekeeper sits at 200), normal enemies gain real mechanics, and the act start introduces an Ancient, an NPC who replaced the old boss-relic draft and now offers Blessings at a price. Treat the Ancient choice as part of your planning: Ectoplasm grants +1 energy every turn but you can no longer gain gold, a bargain if your deck is already assembled and a trap if you still need shop removals.
The gatekeeper question is blunt: is your engine online? If the answer is no, path away from elites and use combats and a shop to finish the build. Infested Prism (200 HP) exists precisely to check whether you came together; a deck still throwing starter-quality attacks at it will pay 40 HP for the lesson. Entomancer (145) summons bees all fight, so bring AoE or burn the caster down directly. Decimillipede is three segments of roughly 40 HP each acting independently, and when one dies while the others live, it Reattaches at 25 HP, which makes AoE a trap: focus one segment at a time and the pressure collapses once two are down.
Normal enemies keep teaching. Tunneler (87) bites for 13, then burrows for +32 Block that never decays and strikes for 23 a turn; breaking all its Block stuns it for a turn, so save burst for the burrow. Ovicopter (124 to 130) spawns 3 tough eggs that hatch into larvae within a couple of turns, and popping the eggs before they hatch makes the fight trivial, which is why AoE is at an absolute premium across this act.
The three bosses each demand a pre-planned answer, so scout which one sits at the top of your map. Knowledge Demon (321-plus) is widely considered the hardest boss in the game: every round it forces a permanent debuff choice on you (6 damage per turn or 1 fewer card drawn, escalating later into card-play and energy caps), and it heals itself while gaining permanent Strength throughout. It is a damage race, and its multi-hit turns, while dangerous, are the best window for retaliation effects like Thorns. The Insatiable (321) starts a Sandpit death timer at 4, and at zero you lose outright; each Frantic Escape card it adds to your deck buys one more turn, so always play your Escape cards, never exhaust cards carelessly, and spend everything. Kaiser Crab (209 plus a 199 claw) Surrounds you: hits from the claw you face away from deal +50%, and the Rocket claw's 31-damage Laser is the lethal move, so focus the Rocket claw first, try to kill both claws within a turn or two of each other, and remember that AoE hits both.
Drafting-wise, Act 2 rewards engines and answers over raw stats: a Noxious Fumes ticking 2 Poison per turn to all enemies, a Haunt punishing every Soul played, an Alignment turning banked Stars into energy. Note that the v0.110 patch reworked the Silent poison package (Haze, Outbreak and Mirage were redesigned), so if your knowledge predates late July, re-check those cards in-game.
Act 3, Glory: Five Elites, Three Bosses, All Mechanics Checks
Act 3 stops asking whether your numbers are big enough and starts asking whether you brought the right tools. The elite pool is five deep, and the three Knight Gang members arrive together as one encounter-shaped problem. Magi Knight (82 HP) carries Aura Dampen, downgrading every card you own while it lives, and cycles toward a 35-damage Magic Bomb: kill it first, it has the lowest HP and removing it deletes both the downgrade and the nuke. Spectral Knight (93) carries Aura Hex, making every card in your hand Ethereal (unplayed cards are discarded at turn end), so kill it second to free your hand. Flail Knight (101) is the tanky one; leave it for last and block its Rams while you clean up.
The two solo elites are the real gates. Mecha Knight (300 HP, 3 Artifact) runs a fixed 4-turn loop: Charge for 25, Flamethrower shoving 4 Burns into your hand, Windup for +5 Strength and +15 Block, then Heavy Cleave for 35. Play or exhaust the Burns immediately, skip attacking on Windup turns, hold 40-plus Block for the Cleave, and if your deck is undercooked, path around it entirely; community consensus calls it the deadliest elite in the game. Soul Nexus (234) always opens with Soul Burn for 29, so the fight is a pop quiz on whether you can produce 29 Block on turn one, then it juggles Maelstrom multi-hits and a Drain Life that hits for 18 while stacking Vulnerable and Weak.
The boss pool is Aeonglass, Test Subject #C10 and The Queen. Test Subject #C10 is a 600-HP marathon across phases of 100, 200 and 300: phase 1 punishes Skills with +2 Strength, so lead with attacks; phase 2 shoves Wounds for unblocked damage, so aim for perfect Block; phase 3 alternates Intangible, so strike only on vulnerable turns. Damage over time resets between phases, which means scaling Powers are the real win condition here. The Queen (roughly 400 HP behind 199 guard) uses Chains of Binding to Bound the first cards you draw each turn, letting you play only one Bound card per turn; the escape hatch is that mid-turn draw is unrestricted, so Acrobatics-style cards let you burst past the chains. Kill her Torch Head Amalgam first or she Enrages into an Execution loop, block through the turn-2 slam of 99 stacks of Weak, Vulnerable and Frail (Artifact answers it if you can find any), and set up your scaling in phase one.
Aeonglass is the newest name in this pool and has been reworked twice this year, so treat specific advice about it with suspicion and read its intents fresh; the general principle stands regardless. Act 3 bosses are pure mechanics checks, and winners pre-plan answers (damage over time, multi-hit, burst windows) before they commit to the boss floor. After the Act 3 boss, the Architect is a scripted story encounter rather than a fight, so burn every resource you were saving. There is nothing after it to save for.
The Eight Mistakes That Kill New Runs, and the Fix for Each
Our mistakes tracker lists the eight habits that end Early Access runs most often. Audit yourself against one per floor and you will climb faster than any tier list can carry you.
First: taking every card. Card rewards feel free and are not, because every extra card dilutes the draws that matter. The fix is a one-question filter at every reward screen: name the specific fight this card wins. No answer, no card. Our card pick guide builds the full framework.
Second: never removing cards. Removing a starter Strike or Defend is usually the single best gold sink in the game, and it is why shops matter more for their removal service than their wares. Events do it for free: Doors of Light and Dark (take the Door of Dark for targeted removal over two random upgrades), the Bathe option at Wellspring, and Dense Vegetation's push-through all thin your deck without spending gold.
Third: only resting at campfires. HP is a resource, and anything above 1 is technically spare. If the next fight cannot kill you, upgrade instead: Defragment doubles its Focus when upgraded (1 to 2), Body Slam drops from 1 cost to 0 and becomes a finisher, Pommel Strike draws twice.
Fourth: hoarding potions for the boss. You have three slots, and a potion that never gets drunk saved nothing. Drink the Block Potion before the telegraphed big hit, the Weak Potion at boss openers, the Strength Potion on turn one of a multi-hit fight. The only hold-forever exception is Fairy in a Bottle, which is insurance, not a drink.
Fifth: dodging every elite. Elites drop relics, relics define runs, and a run that skips them all arrives at Act 2 underpowered and dies there. The workable rule from our FAQ: fight elites once you have one or two answers in the deck and a rest site pathed before them.
Sixth: ignoring enemy intents. Everything is telegraphed and every boss runs a fixed loop; the game is telling you the future and new players decline to read it. Owl Magistrate telegraphs its Verdict (33 damage plus 4 Vulnerable) a full turn in advance, so block 33-plus or spend the turn setting up, never half of both.
Seventh: playing like it is StS1. No boss relics (Ancients replaced them), no permanent Focus on Defect, no Dead Branch, Afflictions instead of Curses. Every one of those differences flips an old habit into a new mistake.
Eighth: mixing Star and Forge cards on Regent. The two resources dilute each other, and the character is balanced around committing to one. If a run offers both lanes, pick one at the first reward screen and keep picking it, all the way to the boss. Drafting discipline is cheaper than regret.
Campfires, Potions and Shops: Stop Hoarding, Start Converting
Three resource systems decide most runs, and all three reward aggression over thrift.
Campfire decisions come down to one honest question: can the next two planned fights kill me at my current HP? If yes, rest. If no, upgrade, because an upgraded keystone shortens every remaining fight, while healed HP only postpones bleeding. Upgrade priorities by payoff: Body Slam to 0 cost turns a Block deck into a two-way engine; Defragment doubles Focus (1 to 2) and every orb thanks you; Catalyst goes from doubling an enemy's Poison to tripling it; Pommel Strike draws twice. Two relics bend the math. Eternal Feather heals 3 HP at rest sites for every 5 cards in your deck, so bigger decks rest better than they think, and Pantograph heals 25 HP at the start of every boss combat, which means the final campfire before a boss can almost always be an upgrade.
Potion discipline is timing, not collection. Block Potion belongs to the turn before a telegraphed heavy hit, whether that is a Mawler Tear or a Mecha Knight Heavy Cleave. Weak and Vulnerable Potions belong to boss openers. Strength Potion and Blessing of the Forge want turn one, where every subsequent multi-hit benefits. Duplicator and Liquid Memories wait for your finisher or a core Power. Gambler's Brew is the savior of bricked opening hands and has saved more Act 2 elite fights than any single card. Fairy in a Bottle is never drunk on purpose; it is held as revival insurance (survive lethal, heal 30% of Max HP), ideally against elites and bosses. The moment a good potion would save 10-plus real HP, that moment is its moment.
Shop trips need a fixed agenda: removal first (a starter Strike or Defend gone is permanent deck quality), then a card that fills a named hole in your plan, then relics, then potions with leftover gold. Everything the shop sells competes with the removal service, and removal usually wins. Membership Card, when it appears, halves every shop price and pays for itself the earlier you buy it, one of the best Shop-rarity finds in the game. If your gold is thin, remember the event economy: at Sunken Treasury the small chest beats the large chest's permanent curse for most runs, and Abyssal Baths' Soak option trades 3 damage for +2 Max HP repeatedly, a trade almost every healthy Act 1 deck should take.
The connective tissue between all three systems: everything you own is convertible into future turns survived or future turns shortened. Gold converts at shops, potions convert at the right moment, campfires convert HP or cards into power. A first win rarely comes from one brilliant pick; it comes from converting slightly better than you leaked, floor after floor.
The Pre-Endgame Checklist: Run This Before You Fight the Final Boss
Before you commit to the Act 3 boss floor, walk this checklist item by item. It takes sixty seconds and catches the failure modes that actually end runs at 90 percent completion.
One: state your win condition in one sentence. Stack Strength, multiply with Vulnerable, cash in with Whirlwind is a sentence. Good cards is not. If you cannot finish the sentence, your next shop and campfire both need to serve it. Two: deck size sanity. Count the deck; if it has grown past roughly 25 cards without a removal to match, the problem is not your luck, it is your skip discipline. Three: boss-pool answers mapped. Name your answer for each possible boss: damage over time or a burst window, a Block plan for the telegraphed heavy turns (Heavy Cleave 35, Verdict 33), multi-hit attacks for Slippery-style mechanics, discard or exhaust answers for status cards that could hit your deck.
Four: potions stocked. Two or more slots filled, ideally a defensive potion plus a Fairy in a Bottle; an Alchemical Coffer purchase fills every potion slot at once and is a legitimate final-shop buy. Five: upgrades spent on keystones rather than starters. A deck where the finisher is upgraded and the Strikes are not is a finished deck in miniature. Six: the HP plan. Arrive at the boss above half health, or carry Pantograph plus potions to fake it. Seven: your character's specific trap, named out loud. Regent: no Star and Forge mixing, ever. Necrobinder: balance Soul generation against Soul spending or boss fights stall out. Silent: Poison is slow against high-HP bosses, so secure the Catalyst doubling or a secondary win condition. Defect: permanent Focus stacking is gone, so orb play must stay active, channel and evoke.
Eight, and most important: is this run your first-win run? The most reliable first win in v0.111 remains Ironclad Strength Scaling, rated difficulty 2 out of 5 in our builds database. The recipe: open fights with Bash to apply Vulnerable, multiply every point of Strength with cheap attacks, then close with Demon Form plus Limit Break (double Strength, no cap). Whirlwind converts accumulated Strength into AoE, and Hellraiser auto-plays every Strike you draw for free, a semi-automatic engine that carries mediocre draws. If Inflame shows up early (2 Strength, 3 when upgraded), take it; it is the premium-value core of the archetype. The alternative, Exhaust Block (Corruption making Skills free but Exhausting them, Dark Embrace drawing off Exhaust, Barricade keeping Block, Body Slam converting it to damage), is even stronger at high difficulty but harder to pilot, so let it wait for win number two.
After the win, Ascension unlocks: escalating difficulty modifiers, one per victory level, with A20 as the full challenge. That ladder is where these habits stop being advice and become reflexes. Values cited here reflect v0.111 beta; the game is patched often (v0.110 reworked Silent's poison package, v0.109 nerfed Aeonglass), so when a number looks off in-game, trust the client over any guide, including this one.