🛡️ Slay the Spire 2 — Ironclad Deep Dive

Last updated: June 1, 2026 | Reading time: 14 minutes | All Ascension levels

Why Play Ironclad?

The Ironclad is Slay the Spire 2's most beginner-friendly character, but don't mistake accessibility for simplicity. At high Ascension levels, the Ironclad has one of the deepest toolkits in the game — combining raw damage, self-sustain, exhaust-based deck thinning, and the new Bleed mechanic. He's the only character who can reliably gain max HP (Feed), heal mid-combat (Reaper), and turn his entire deck into a zero-cost engine (Corruption). If you want a character who rewards aggressive play but has the sustain to survive mistakes, the Ironclad is your pick.

His starting relic, Burning Blood, heals 6 HP at the end of each combat. This alone makes him the most forgiving character for new players — over the course of a 3-act run, Burning Blood can heal 150-200 HP. That's essentially an extra life bar. His starting deck is Strike×5, Defend×4, and Bash (2-cost, deals 8 damage and applies 2 Vulnerable). Vulnerability is a core Ironclad mechanic — it increases attack damage taken by 50% for the duration, making Bash an excellent setup tool for your early attack cards.

Archetype 1: Strength Stacking (S-Tier)

Strength stacking is the Ironclad's signature build and the most intuitive way to play him. Every point of Strength adds 1 to all attack damage, and the Ironclad has multiple ways to scale Strength throughout combat. The build works by layering Strength sources (Inflame, Spot Weakness, Limit Break) and then converting that Strength into damage through multi-hit attacks (Sword Boomerang, Heavy Blade, Twin Strike) or life-stealing finishers (Reaper).

The dream engine: Demon Form (3-cost Power, gain 2/3 Strength per turn) + Limit Break (1-cost Skill, double your Strength). Once you have both in play, your Strength doubles every turn. Add Reaper to heal back any damage you took while setting up. On A20, the key challenge is surviving long enough to get Demon Form into play — this is where cards like Impervious (gain 30/40 Block, exhausts) and Offering (lose 6 HP, gain 2 energy, draw 3/5 cards) become essential. Offering is arguably the best card in the Ironclad's pool — it solves energy, draw, and deck speed in one package.

Key Strength cards by priority: Limit Break > Reaper > Heavy Blade > Sword Boomerang > Spot Weakness > Inflame > Flex. Key relics: Vajra (+1 Strength permanent), Girya (+3 Strength when used), Brimstone (+2 Strength per turn but enemies also gain 1), Red Skull (+3 Strength below 50% HP). Note: Brimstone requires careful play at high Ascension because enemies scale too, but it can single-handedly win low-Ascension runs.

Archetype 2: Exhaust Engine (S-Tier, Best A20 Build)

If Strength stacking is the Ironclad's sword, the Exhaust engine is his nuclear option. No other build in Slay the Spire 2 is as consistently dominant at A20. The core interaction: Corruption (3-cost Power) makes all Skills cost 0 but exhaust when played. Dark Embrace (2/1-cost Power) draws 1 card whenever a card is exhausted. Feel No Pain (1-cost Power) generates 3/4 Block whenever a card is exhausted. Together, these three powers turn your deck into a perpetual motion machine — you play Skills for free, they exhaust, you draw new cards, you gain Block, you play more Skills.

Fiend Fire (2-cost Attack) is the deck's finisher — exhaust your entire hand, dealing 7/10 damage per card exhausted. With Dark Embrace and Feel No Pain active, Fiend Fire simultaneously deals massive damage, draws a new hand, and generates a full block for the turn. If you find Dead Branch (Rare relic: adds a random card to hand whenever a card is exhausted), the game is effectively over — Corruption + Dead Branch creates infinite random cards, and something in that chaos will win.

The beauty of the Exhaust engine is that it solves Slay the Spire's fundamental problem: bad draws. Once Corruption is in play, you can't draw badly because you're cycling through your entire deck every turn. Status cards from enemies (Dazed, Wound, Burn) become resources — they still trigger Dark Embrace and Feel No Pain when they exhaust. At A20, where consistency is everything, this build delivers.

Key Exhaust cards by priority: Corruption > Dark Embrace > Feel No Pain > Fiend Fire > Second Wind > True Grit. Key relics: Dead Branch (S+), Charon's Ashes (3/5 damage to all enemies per exhaust), Medical Kit (play Status cards, they exhaust), Strange Spoon (50% chance to not exhaust — anti-synergy, avoid!).

Archetype 3: Block Engine / Barricade (A-Tier)

The Block engine is the Ironclad's defensive build. It plays differently from anything else in the game — instead of dealing damage and occasionally blocking, you build an impenetrable shield and then convert that shield into damage. The core: Barricade (3/2-cost Power) makes Block not expire at the start of your turn. Entrench (2-cost Skill) doubles your current Block. Body Slam (1/0-cost Attack) deals damage equal to your current Block.

The build is slow to set up but nearly unkillable once online. A typical sequence: turn 1, play Barricade + Shrug It Off (gain 8/11 Block, draw 1). Turn 2, play Impervious (gain 30/40 Block) + Entrench (now at 80 Block). Turn 3, play Body Slam (80 damage for 0/1 energy) + more block cards. By turn 5, you have 300+ Block and Body Slam is dealing 300+ damage for free.

The main weakness: setup time. Barricade costs 3 energy (2 upgraded), and you often need to take a hit on the turn you play it. Against fast-scaling enemies like Book of Stabbing or Gremlin Leader, this can be fatal. The build also struggles against enemies that apply Frail (reduces Block gained by 25%) unless you have artifact charges. Fossilized Helix (prevents first damage each combat) and Anchor (start with 10 Block) partially solve the setup problem.

Key Block cards by priority: Barricade > Entrench > Body Slam > Shrug It Off > Impervious > Ghostly Armor. Key relics: Calipers (lose 15 Block instead of all at turn start), Self-Forming Clay (gain 3 Block when you lose HP — anti-synergy when you have Barricade up, but great before), Fossilized Helix, Anchor.

Archetype 4: Bleed / Hemorrhage (A-Tier, New in STS2)

STS2 introduces the Bleed mechanic exclusively for the Ironclad. Bleed is a damage-over-time effect: enemies take damage at the start of their turn equal to their Bleed stacks, and stacks decay by 1 each turn. Unlike Poison (which doesn't decay), Bleed rewards you for stacking it high and letting enemies take multiple turns — making it a more patient, defensive playstyle.

Hemorrhage (2-cost Attack, deal 8/10 damage, apply 4/5 Bleed) is the core card. Multiple copies stack the debuff quickly. Blood Pact (1-cost Rare Skill, lose 3 HP, apply 10/14 Bleed) is the high-risk, high-reward scaler — it can end fights in 1-2 turns but costs significant HP. Bloodletting (0-cost Skill, lose 3 HP, gain 1/2 Energy) provides energy while fueling self-damage synergies. Rupture (1-cost Power, whenever you lose HP from a card, gain 1 Strength) converts self-damage into permanent damage scaling — transforming cards like Blood Pact and Offering from "cost" into "investment."

The optimal Bleed build pairs with Block-heavy cards to stall while enemies bleed out. Shrug It Off, Impervious, and Ghostly Armor let you turtle while Bleed does the work. Reaper provides sustain to offset self-damage. Against bosses with high HP, Bleed stacks can reach 20-30 per turn, rivaling poison builds in damage output. The build is still being optimized as Early Access progresses — initial data suggests it's A-tier for A20, with potential to reach S-tier as players refine the card pool.

Key Bleed cards by priority: Blood Pact > Hemorrhage > Rupture > Bloodletting > Reaper. Key relics: Blood Vial (heal 2 per combat — small but consistent), Magic Flower (healing +50%), Meat on the Bone (heal 12 when below 50% HP — excellent safety net for the self-damage playstyle).

Ironclad Card Removal Priority

The Ironclad starts with 5 Strikes and 4 Defends. Strikes are bad — 6 damage for 1 energy is below rate on floor 1 and embarrassing by floor 20. Remove Strikes first, always. Defends are worth keeping longer because Ironclad has less innate block than Silent or Defect. Optimal removal order: Strike > Strike > Strike > Curse cards > Strike > Defend (if you have Barricade engine, keep Defends longer). Spend 75 gold on removal at every shop. A 15-card Ironclad deck with Corruption, Dark Embrace, Feel No Pain, and Fiend Fire will beat A20. A 35-card Ironclad deck with the same four cards buried in filler won't.

Pathing Advice

Act 1: Prioritize elites. Ironclad's high HP pool and Burning Blood sustain make him the best character for aggressive Act 1 pathing. Aim for 2-3 elite fights, with campfires before the first elite. Act 2: Shift to ? rooms and shops. Your deck should have its identity by now; shops let you remove Strikes and hunt for rare relics. Act 3: Campfires for upgrades. You should have your key cards by now — upgrading them is more valuable than adding new cards.

The Ironclad rewards boldness. He can survive mistakes that would kill other characters. Use that HP buffer to take calculated risks — an extra elite fight in Act 1 might give you Dead Branch, and Dead Branch + Corruption is a won run. Fortune favors the aggressive.