The Ironclad is Slay the Spire 2’s warrior class: high HP, Strength-fuelled attacks, and an Exhaust mechanic that rewards knowing when to burn your own deck. In Early Access, three distinct build archetypes have emerged from community testing at every Ascension level. This guide breaks down the card packages, relics, and piloting logic for each one — plus the ascension adjustments and mistakes that separate a consistent climber from someone who stalls on Act 3.
Before diving into builds, check the Slay the Spire 2 beginner guide if you are still learning core mechanics like energy management, map routing, and boss relic selection — those fundamentals apply to every archetype below.
What Makes the Ironclad Different in STS2
The Ironclad starts every run with Burning Blood (heal 6 HP at the end of every combat) and Burn+ in the discard pile — a card that deals damage over time to you but can be leveraged with Exhaust synergies. Compared to the other STS2 characters, the Ironclad is the most forgiving early on thanks to its 80 base HP and built-in healing, but demands tighter decision-making by Act 3 when enemy damage scales sharply.
Three mechanics define how Ironclad decks work:
- Strength: A persistent buff that adds flat damage to every attack. The Ironclad has more ways to gain Strength than any other character.
- Exhaust: Cards leave the game for the rest of combat when exhausted. Several Ironclad cards and relics trigger on each Exhaust event.
- Block generation: The Ironclad has access to high-block skills and the unique Barricade card that carries block across turns.
Each of the three builds below leverages one of these mechanics as its primary win condition.
Build 1 — Strength Scaling (The Core Archetype)
Strength scaling is the Ironclad’s identity. Stack Strength fast, hit hard with multiplier attacks, and end combats before enemies can outpace your healing. This is the most consistent build across all act types and the one the community recommends learning first.
These tips go deeper in slay spire silent build.
Core Card Package
| Card | Role | Priority |
|---|---|---|
| Inflame | +2 Strength permanently | S-tier pickup |
| Limit Break | Double your current Strength (exhaust) | S-tier pickup |
| Demon Form | Gain 2 Strength each turn (costs 3 energy) | A-tier if energy allows |
| Heavy Blade | 14 damage + 3x Strength bonus | A-tier primary attacker |
| Rampage | 8 damage, gains +5 on each play | B-tier ramping attacker |
| Pommel Strike | 9 damage + draw 1 | B-tier cycle and attack |
| Twin Strike | 5 damage twice (benefits from STR twice) | B-tier STR doubler |
| Bash | Apply Vulnerable, amplifies all subsequent attacks | Keep until Act 3 |
The win condition: get to 10+ Strength via Inflame stacks and one or two Limit Break activations, then close fights in two or three Heavy Blade swings. Demon Form is the late-game engine but costs 3 energy — only take it if your deck can afford the energy turn.
Must-Have Relics
- Vajra — +1 Strength at the start of every combat, free value that compounds across the entire run.
- Bag of Marbles — Applies Vulnerable to all enemies at combat start, effectively multiplying every attack by 50%.
- Red Skull — Gain 3 Strength when below 50% HP. Synergises with Burning Blood healing — you can deliberately fight in the red zone and heal between encounters.
- Paper Krane — Take 75% damage from Weakened enemies. Pair with Shockwave or Warcry to Weaken elites.
How to Pilot
Early game (Acts 1–2): Prioritise Inflame over almost everything else. Two Inflames on the board by end of Act 1 gives you a reliable damage floor. Keep your deck lean — the most common mistake is adding too many cards and diluting Inflame draws. Take every Strength-adding event reward you see.
Mid game (Act 2): Look for a first Limit Break at the Act 2 shop or elite rewards. A single Limit Break with two Inflames puts you at 8–10 Strength before any combat attack — enough to two-shot most Act 2 enemies. Start cutting Dead Strikes and Defends once you have a solid damage floor.
Late game (Act 3 / Boss): Demon Form becomes viable once you have 4+ energy sources. Add one or two more attack cards with high base damage (Heavy Blade preferred). Boss relics: Cursed Key gives free energy at the cost of Curses, which this build can absorb if your deck cycles fast.
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Build 2 — Exhaust Engine
The Exhaust build is the Ironclad’s most explosive archetype. With the right combo, a single turn can deal 60+ damage while drawing your entire hand. The engine requires specific pieces — it is harder to assemble than Strength scaling but produces more consistent Act 3 clear speeds when it comes together.
Core Card Package
| Card | Role | Priority |
|---|---|---|
| Corruption | All Skills cost 0 energy and exhaust | S-tier linchpin |
| Feel No Pain | Gain 3 Block each time a card is exhausted | S-tier defence engine |
| Dark Embrace | Draw 1 card each time a card is exhausted | A-tier draw engine |
| Offering | Lose 6 HP, gain 2 energy, draw 3 cards (exhaust) | A-tier burst enabler |
| Fiend Fire | Exhaust your entire hand, deal 7 damage per card exhausted | A-tier finisher |
| Sever Soul | Exhaust all non-Attack cards, deal 22 damage | B-tier cleanup |
| Shrug It Off | Gain 8 Block, draw 1 | Becomes free with Corruption |
| Warcry | Draw 2, put 1 on top of deck (exhaust) | B-tier setup card |
Corruption is the linchpin. Without it, your Skills still cost energy and the engine does not function. Prioritise finding Corruption in Act 2 shops and elite rewards — it is worth skipping boss relics to ensure the mechanic is online by Act 3.
Must-Have Relics
- Dead Branch — When you exhaust a card, add a random card to your hand. With Corruption live, every Skill play generates a free card, creating an infinite-feeling hand.
- Strange Spoon — 50% chance that cards which would exhaust are not exhausted instead. Counterintuitively useful: your Feel No Pain and Dark Embrace still trigger, but you keep recurring attackers.
- Charon’s Ashes — Deal 3 damage to all enemies whenever a card is exhausted. With Corruption and a full hand of Skills, this can deal 30–40 passive AoE damage per turn.
How to Pilot
Early game: Play a normal Ironclad game. Corruption is mid-game card — do not take Dead Branch or Dark Embrace before Corruption is confirmed in your deck, as they contribute little without the exhaust trigger. Stack standard removal (Defend → Shrug It Off, Strike → Pommel Strike).
Mid game: The moment Corruption lands, reorder your priorities. Now every Skill in your deck becomes free block generation and draw fuel. Add Feel No Pain immediately if offered. Dark Embrace turns the engine into a full draw-through each cycle.
Late game: Keep the deck small. The exhaust engine degrades with deck bloat — you need to reliably draw Corruption within 1–2 cycles. The ideal deck is 12–16 cards: Corruption, 2× Feel No Pain, Dark Embrace, Offering, Fiend Fire, and the rest efficient attacks.
Build 3 — Barricade Block Control
Barricade Control ignores offense almost entirely in the early game, builds an impenetrable Block wall, then uses Body Slam to deal damage equal to your accumulated block total. It is the hardest Ironclad build to pilot because it requires specific relic support and can stall against enemies with Block-stripping mechanics.
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Core Card Package
| Card | Role | Priority |
|---|---|---|
| Barricade | Block is no longer removed at the start of your turn | S-tier — build does not function without it |
| Entrench | Double your current Block (costs 2 energy) | S-tier scaling tool |
| Body Slam | Deal damage equal to your current Block | A-tier win condition |
| Impervious | Gain 30 Block (exhaust) | A-tier block spike |
| Shrug It Off | Gain 8 Block, draw 1 | A-tier efficient blocker |
| Iron Wave | Gain 5 Block, deal 5 damage | B-tier dual-purpose |
| Juggernaut | Each time you gain Block, deal 5 damage to a random enemy | B-tier passive damage |
| Sentinel | Gain 5 Block. If exhausted, gain 2 energy | B-tier energy recovery |
Must-Have Relics
- Calipers — At the start of your turn, only lose 15 Block rather than all of it. Makes the build viable even without Barricade in hand every cycle.
- Thread and Needle — Gain 4 Plated Armor at the start of each combat. Free block that persists through the run stacks with Barricade accumulation.
- Oddly Smooth Stone — Start each combat with 1 Dexterity. Small but compounds over a long block-building phase.
How to Pilot
Early game: Prioritise finding Barricade above everything. Take the Ironclad event that offers a random rare card — Barricade has a strong chance of appearing. If Barricade does not appear by Act 2, pivot to Strength Scaling using the Inflame cards you have collected.
Mid game: Once Barricade is live, start accumulating block every turn even when enemies are not attacking. A turn 1 Shrug It Off + Entrench gives 16 block passively. By turn 3–4, Body Slam should be dealing 40–80 damage with minimal card investment.
Late game: The build struggles against Act 3 bosses with Strength scaling (Donu + Deca, Time Eater). Supplement with one or two Whirlwind or Heavy Blade cards to deal direct damage during the turns you cannot afford to Entrench.
Ascension-Level Considerations
All three builds shift priorities as Ascension level increases. Use the STS2 tips guide for a broader breakdown of ascension-level strategy.
| Ascension | Build Impact | Adjustment |
|---|---|---|
| A0–A4 | All three viable | Play to the cards you find; no strict changes needed |
| A5–A9 | Exhaust engine becomes stronger | Enemies deal more damage — passive block from Feel No Pain becomes essential |
| A10–A14 | Strength scaling tightens | Need Limit Break by Act 2; cannot rely on Demon Form alone |
| A15+ | Barricade control weakest | More enemies debuff Dexterity and strip Block — requires Calipers to stay stable |
| A20 | Exhaust engine preferred | Corruption + Dead Branch gives the most burst and is least affected by stat nerfs |
Common Ironclad Mistakes
- Over-drafting the deck. The Ironclad’s power comes from drawing the same key cards repeatedly. A 25-card deck dilutes Inflame and Corruption draws. Target 15–20 cards max by Act 3.
- Taking Demon Form too early. Demon Form costs 3 energy. If your energy base is 3 (standard), Demon Form uses your entire turn and leaves you with zero energy for attacks or blocks. Only take it once you have 4+ energy sources or a reliable energy relic like Cursed Key.
- Skipping Barricade opportunities when building Block-centric. If you have already committed to the Block build and Barricade appears at a shop, buy it regardless of gold pressure. Without it, the build does not scale into Act 3.
- Misusing Limit Break timing. Limit Break doubles Strength but exhausts. Use it on a turn when you can also attack — not as a standalone. A common mistake is using Limit Break on turn 1 with no attacks in hand, wasting the multiplied Strength for a full cycle.
- Adding Curses without draw power. Boss relics like Cursed Key add Curses each combat. Without Warcry, Offering, or Pommel Strike to cycle past them, Curses clog your hand and kill momentum in long Act 3 fights.
Frequently Asked Questions
What is the best Ironclad build for beginners in STS2?
Strength Scaling. It is the most forgiving, requires the fewest specific pieces (Inflame is common), and teaches the core Ironclad rhythm of buffing before attacking. It also transitions naturally into the Exhaust build if Corruption appears late.
Is Demon Form worth taking in STS2 Early Access?
Yes, but only at 4+ energy. At 3 base energy, Demon Form consumes your entire turn. With Cursed Key or an Energy Relic, it becomes one of the strongest win conditions in the game.
Can you run multiple archetypes in one deck?
Partially. Strength scaling and Exhaust engine overlap well — both benefit from a small, cycling deck and Corruption synergises with Strength. Barricade Control does not hybridise cleanly with either; commit fully once you find Barricade.
Does the Runes mechanic in STS2 affect Ironclad builds?
Yes. Attack-heavy decks like Strength Scaling generate Fury Runes faster, which power certain rune-activated relics and events. Exhaust builds generate fewer runes since Skills exhaust before rune thresholds are reached. Prioritise Fury Rune synergy relics in Strength builds; focus on Exhausted-event relics in Exhaust builds.
What is the best boss relic for the Ironclad?
It depends on the build. Strength Scaling: Cursed Key (free energy) or Black Star (forces two elite fights per act, more relic opportunities). Exhaust Engine: Runic Pyramid (retain your hand each turn — devastating with Corruption live). Block Control: Calipers if available at boss reward; otherwise Sozu to save gold for shops.
Sources
- Steam. Slay the Spire 2 Early Access page. MegaCrit
- Reddit r/slaythespire. Ironclad build tier discussions and Early Access meta threads
- Slay the Spire Wiki. Card database and mechanic references. Fandom
I've been playing video games for over 20 years, spanning everything from early PC titles to modern open-world games. I started Switchblade Gaming to publish the kind of accurate, well-researched guides I always wanted to find — built on primary sources, tested in-game, and kept up to date after patches. I currently focus on Minecraft and Pokémon GO.