Slay the Spire 2 Ironclad Guide: Best Builds & Strategy

Ironclad is one of the best characters for learning Slay the Spire 2 fundamentals because his early game teaches the most important lesson in the game:

Spend HP only when it buys power.

Ironclad can afford that trade more often than other characters because Burning Blood heals 6 HP after combat. That does not mean you can ignore defense. It means Ironclad can turn early HP into elites, relics, upgrades, and stronger routes if the deck has enough tempo.

The best Ironclad runs usually start from the same foundation:

frontloaded damage → Vulnerable → elite farming → card quality → late scaling

After that, the build depends on what the run offers.

For general fundamentals, start with the Slay the Spire 2 Beginner Guide.

Early Access Version Note

Slay the Spire 2 is still in Early Access, so exact card numbers, relic values, and infinite-loop interactions can change between patches.

This guide uses current public Early Access card names and avoids treating fragile infinite loops as mandatory. In particular, Hellraiser + Pommel Strike style loops should be viewed as a powerful engine when supported, not as a guaranteed best build.

Fast Answer

Question	Best practical answer
Best beginner Ironclad build?	Vulnerable Tempo with Bash, Pommel Strike, Headbutt, Uppercut, Thunderclap, or Break.
Best late-game scaling?	Strength, Exhaust, or Body Slam Block, depending on support.
Best early Ironclad goal?	Use Burning Blood healing 6 HP after combat to take prepared elites, not random chip damage.
Best early cards to look for?	Pommel Strike, Headbutt, Shrug It Off, Uppercut, Whirlwind, Molten Fist, Break.
Best upgrade targets?	Pommel Strike+, Whirlwind+, Body Slam+, Uppercut+, Bash+, Shrug It Off+.
Biggest trap?	Taking every medium attack after damage is already solved.
Best high Ascension habit?	Remove Strikes aggressively and build a real engine, not a pile of medium attacks.
Most important relic angle?	Relics that improve elite tempo, Vulnerable payoff, Strength, draw, or HP efficiency.

Ironclad’s Core Advantage: Burning Blood

Burning Blood is not just a small heal. It changes how Ironclad should evaluate Act 1.

Because Ironclad heals 6 HP at the end of combat, he can often:

• take an early elite slightly sooner than other characters
• accept controlled HP loss for a strong relic or card reward
• upgrade instead of resting when fights went reasonably well
• take events that cost HP if the reward improves the run
• survive chip damage while drafting more aggressively

The mistake is treating Burning Blood as permission to bleed every fight.

A good Ironclad run spends HP to gain power. A bad Ironclad run spends HP because fights are taking too long.

Use this rule:

HP loss	Interpretation
5-10 HP to win a hallway fight faster	usually acceptable
15-25 HP to beat a prepared elite	often acceptable if the reward improves the run
30+ HP to beat one elite	warning sign unless the reward is run-changing
repeated chip damage every fight	deck problem, not just HP economy

The Ironclad Foundation Before Any Build

Before committing to Strength, Exhaust, Body Slam, or Bloodletting, most Ironclad decks need the same shell.

Need	Good examples	Why it matters
Frontloaded damage	Pommel Strike, Headbutt, Molten Fist, Break, Whirlwind	kills hallway fights before HP bleeds out
Vulnerable	Bash, Thunderclap, Uppercut, Break, Molten Fist	turns attacks into tempo
Block/card flow	Shrug It Off, Flame Barrier, Impervious, Battle Trance, Burning Pact	prevents forced rests and dead turns
Elite answer	Whirlwind, Uppercut, Break, Dismantle, potions	lets Burning Blood convert HP into relics
Future scaling	Inflame, Demon Form, Feel No Pain, Body Slam, Barricade	gives the deck a boss plan

This foundation matters more than the name of your build.

If the deck cannot survive the next elite, it is not a build yet. It is a pile of future ideas.

Best Ironclad Build Paths

Build path	Core idea	Key cards	Main risk
Vulnerable Tempo	apply Vulnerable and end fights quickly	Bash, Thunderclap, Uppercut, Break, Molten Fist, Bully, Dismantle	falls off if you never add scaling
Strength Scaling	turn Strength into boss damage	Inflame, Demon Form, Rupture, Sword Boomerang, Twin Strike, Whirlwind	too slow without block/draw
Exhaust / Deck Control	remove bad cards during combat and trigger payoffs	Corruption, Dark Embrace, Feel No Pain, Burning Pact, Second Wind, Fiend Fire	speculative pieces do nothing alone
Body Slam Block	convert Block into damage	Body Slam, Barricade, Entrench, Shrug It Off, Impervious, Flame Barrier, Juggernaut	needs enough block and setup time
Bloodletting / HP-Spend	use HP loss as energy, damage, or Strength fuel	Bloodletting, Offering, Hemokinesis, Rupture, Brand, Crimson Mantle	can kill you if HP math is sloppy
Big Attack / Burst	use high damage, Vulnerable, and upgrades to hit breakpoints	Headbutt, Pommel Strike, Break, Bludgeon, Whirlwind, Perfected Strike	becomes clunky if you keep adding attacks

Build 1: Vulnerable Tempo Ironclad

This is the safest default Ironclad path.

The plan is simple:

1. Apply Vulnerable.
2. Use efficient attacks during the window.
3. End the fight before enemy scaling matters.

Core Cards

Card	Why it matters
Bash / Bash+	starter Vulnerable; upgrading improves uptime
Thunderclap	AoE Vulnerable; better in multi-enemy fights and Vulnerable payoff decks
Uppercut / Uppercut+	applies Weak and Vulnerable; excellent boss and elite utility
Break	large single-target damage plus heavy Vulnerable
Molten Fist	early damage that doubles Vulnerable and Exhausts itself
Bully	rewards enemies already being Vulnerable
Dismantle	hits twice if the enemy is Vulnerable
Cruelty / Vicious	payoff powers when your deck reliably applies Vulnerable

Relics That Help

Relic	Why Ironclad likes it
Bag of Marbles	starts fights with Vulnerable on all enemies
Paper Phrog	makes Vulnerable enemies take even more damage
Akabeko	boosts first attack turns, especially with AoE or big hits
Bag of Preparation	helps find Bash, Uppercut, or payoff attacks earlier
Vajra	adds immediate Strength, improving every attack turn

When to Commit

Commit when you already have at least two of these:

• reliable Vulnerable beyond starter Bash
• a damage card that becomes much better into Vulnerable
• draw or Headbutt to line up the right attack
• a relic that rewards early damage or Vulnerable
• a route with elites you can punish quickly

When to Stop Taking Attacks

Stop adding average attacks when the deck already kills Act 1 hallway fights and can fight elites. At that point, you need draw, removal, block, or scaling more than another 1-energy hit.

Build 2: Strength Scaling Ironclad

Strength is Ironclad’s classic long-fight plan. It becomes powerful when your deck can play repeated attacks, multi-hit attacks, or big finishers after the Strength is online.

Core Cards

Card	Role
Inflame	simple early Strength; good when fights last long enough
Demon Form	slow but strong boss engine
Rupture	rewards HP-loss cards
Bloodletting	energy for big turns, especially with draw
Offering	HP for energy and cards
Sword Boomerang / Twin Strike / Whirlwind	convert Strength into multiple hits
Thrash	can scale as the fight progresses
Pommel Strike	keeps Strength turns moving because it deals damage and draws

Relics That Help

Relic	Why it matters
Vajra	starts combat with Strength
Red Skull	gives Strength when HP is low
Brimstone	powerful Strength engine, but dangerous because enemies also scale
Demon Tongue	doubles the first Strength gain each combat
Bag of Preparation	finds Strength powers earlier

When Strength Is Good

Strength is good when:

• your deck can block while setting up
• you have multi-hit or repeated attack output
• you have draw to find Strength cards early
• your boss plan needs more long-fight damage
• Burning Blood and HP relics let you absorb self-damage cards

When Strength Is Bad

Strength is bad when:

• your deck is still losing Act 1 hallway fights
• Demon Form is your only plan and you cannot safely spend 3 energy
• you have no draw and keep finding scaling too late
• the deck has too many slow powers already

Do not draft Strength because the word looks powerful. Draft it because the next fights give you time to use it.

Build 3: Exhaust / Deck Control Ironclad

Exhaust is one of Ironclad’s strongest advanced directions because it improves hand quality during combat while triggering powerful payoffs.

Core Cards

Card	Role
Corruption	turns Skills into free cards that Exhaust
Dark Embrace	draws when cards Exhaust
Feel No Pain	gains Block when cards Exhaust
Burning Pact	Exhausts a card and draws
Second Wind	converts non-attacks into Block and Exhaust triggers
Fiend Fire	finisher and mass Exhaust tool
True Grit	block plus Exhaust control
Ashen Strike / Pact’s End	payoff damage in decks that build an Exhaust pile

Relics That Help

Relic	Why it matters
Charon’s Ashes	deals AoE damage when you Exhaust
Joss Paper	adds draw after repeated Exhaust triggers
Burning Sticks	gives extra cards when Exhaust happens
Bag of Preparation	finds powers faster
Toxic Egg / upgraded Skill relics	improves the many Skills these decks often play

Commit Only When the Pieces Are Real

Exhaust is not one card. It is an engine.

Take early Exhaust cards when they are already useful:

• Burning Pact draws.
• True Grit blocks.
• Second Wind can solve status-heavy turns.
• Fiend Fire can be a finisher.

Be more careful with payoff-only cards before you have enablers. Dark Embrace and Feel No Pain are excellent when cards are actually Exhausting; they are slow if they sit in a deck with no triggers.

Build 4: Body Slam Block Ironclad

Body Slam is the biggest missing archetype in many beginner Ironclad runs.

Instead of asking, “How do I deal damage while blocking?” this build asks:

What if blocking is my damage?

The key support is not only Barricade. In the current Early Access relic pool, Sturdy Clamp is the Calipers-style relic that lets up to 10 Block persist across turns. That makes Body Slam decks more forgiving when you have not found Barricade yet, because you can carry part of a strong block turn into the next turn instead of rebuilding from zero every round.

Core Cards

Card	Role
Body Slam / Body Slam+	converts current Block into damage; upgrade to 0 cost is huge
Barricade	keeps Block between turns
Entrench	multiplies existing Block
Shrug It Off	block plus draw
Flame Barrier	large block turn
Impervious	massive block spike
Stone Armor / Unmovable / Colossus	additional block scaling or mitigation tools
Juggernaut	turns Block gain into damage

Relics That Help

Relic	Why it matters
Anchor	starts combat with Block
Orichalcum	covers weak defensive turns
Self-Forming Clay	gives future Block after HP loss
Horn Cleat	helps a dangerous early turn
Sturdy Clamp	Calipers-style support; lets up to 10 Block persist across turns
Bellows	upgrades the first hand, which can improve block turns
Paper Phrog	still useful because Body Slam damage benefits from Vulnerable

When to Commit

Commit when:

• you already have Body Slam plus real block
• Body Slam+ is a realistic upgrade target
• you find Barricade, Entrench, Sturdy Clamp, or strong block relics
• your deck can survive setup turns
• you have enough draw to find both block and payoff

Do not take Body Slam just because you saw one block card. The build needs a block engine, not one defensive card.

Build 5: Bloodletting / HP-Spend Ironclad

Ironclad is better than most characters at spending HP because Burning Blood refunds some damage after fights. That makes HP-spend cards attractive, but only when the math is controlled.

Core Cards

Card	Role
Bloodletting	HP into energy
Offering	HP into energy and draw
Hemokinesis	efficient damage at an HP cost
Rupture	turns HP loss into Strength
Brand	small HP cost, Exhaust, and Strength
Crimson Mantle	repeated HP loss for block
Inferno	payoff for losing HP on your turn
Spite	rewards HP-loss turns with extra hits

Relics That Help

Relic	Why it matters
Red Skull	rewards being at or below half HP
Self-Forming Clay	turns HP loss into later Block
Black Blood	stronger post-combat healing
Brimstone	pairs with aggressive HP-spend race plans
Demon Tongue	increases the first Strength gain, strong with Rupture/Inflame lines

The HP Rule

Only take HP-spend cards when at least one of these is true:

• the card wins the fight faster than the HP it costs
• you have Burning Blood or stronger healing to recover
• you have Rupture, Red Skull, or another payoff
• the card gives energy/draw that enables a decisive turn
• your route has recovery after the risk

Avoid stacking too many HP-cost cards without a plan. Burning Blood helps, but it does not save a deck that pays HP to do nothing.

Build 6: Big Attack / Burst Ironclad

This is not always a full endgame archetype. It is often the Act 1 and Act 2 shell that lets you survive long enough to find a stronger plan.

Core Cards

Card	Role
Pommel Strike	damage plus draw; upgrade makes it much better
Headbutt	replays your best card by putting it back on top
Break	high damage and Vulnerable
Bludgeon	huge single hit
Whirlwind	AoE and energy sink
Perfected Strike	works only if your deck actually supports Strike-synergy
Molten Fist	efficient damage that Exhausts itself and stacks Vulnerable

Relics That Help

Relic	Why it matters
Akabeko	improves first attack burst
Bag of Marbles	makes opening attack turns stronger
Vajra	adds immediate damage to every attack
Bag of Preparation	finds the burst card sooner
Strike-damage relics	can justify Perfected Strike or Strike packages

Main Risk

Burst decks fall apart when they keep taking attacks after the deck already kills things. Once your damage is solved, switch priorities:

1. draw
2. removal
3. block
4. scaling
5. boss answer

Infinity / Hellraiser Note

Do not make “infinite deck” the default recommendation.

Hellraiser and Pommel Strike can still create powerful card-flow turns, especially when the deck has draw, energy, and a small card pool. But Early Access balance has targeted easy infinite loops, so treat this as an engine you may discover, not a build you force every run.

Practical rule:

Situation	Decision
You already have Pommel Strike+, draw, energy, and a thin deck	Hellraiser can be worth building around
You have Hellraiser but no draw or deck control	do not assume it wins alone
Your deck is large and full of medium attacks	stop chasing infinite lines; refine the deck first
Patch notes change Hellraiser/Pommel interactions	update the section before publishing recommendations

What to Upgrade First

The best upgrades change fight outcomes. They do not just add small numbers.

Upgrade	Why it is valuable
Pommel Strike+	draw 2 makes the card a real engine piece
Whirlwind+	damage jumps from 5 to 8 per hit, a major AoE breakpoint
Body Slam+	cost reduction to 0 changes entire block turns
Uppercut+	doubles Weak and Vulnerable duration
Bash+	improves Vulnerable uptime from the starter deck
Shrug It Off+	better block while preserving card flow
Molten Fist+	stronger burst without adding permanent bloat because it Exhausts

Upgrade priority:

1. cost reductions that change turns
2. draw upgrades
3. damage breakpoints that kill one turn earlier
4. Weak/Vulnerable uptime
5. block breakpoints that prevent forced rests
6. scaling powers once the deck can survive setup

Do not upgrade a card just because you play it often. Upgrade it because the next elite, boss, or route becomes safer.

Ironclad Relic Priorities

This is not a full relic tier list. It is a role checklist.

Relic type	Examples	Why Ironclad wants it
HP recovery	Burning Blood, Black Blood	enables controlled HP spending
Opening tempo	Bag of Marbles, Akabeko, Anchor, Bag of Preparation	makes Act 1 elites safer
Strength	Vajra, Red Skull, Brimstone, Demon Tongue	supports Strength and burst plans
Vulnerable payoff	Paper Phrog	makes Ironclad’s core debuff more lethal
Exhaust payoff	Charon’s Ashes, Joss Paper, Burning Sticks	turns Exhaust into damage/draw/value
Block support	Sturdy Clamp, Orichalcum, Self-Forming Clay, Horn Cleat	helps Body Slam and setup turns
Upgrade support	Whetstone, Toxic Egg, Bellows	improves card quality without spending campfires

The best relic is often the one that changes your route. If a relic lets you fight one more elite, smith instead of rest, or survive Act 2, it is doing real work.

High Ascension Ironclad Priorities

High Ascension Ironclad is less forgiving because hallway fights, elites, and bosses punish slow setup harder. Every card slot should either solve the next fight or strengthen your real engine.

Priority	What it means in practice
Remove Strikes early	every Strike you draw is often a missed Pommel Strike, block card, or engine piece
Upgrade engine cards quickly	Pommel Strike+, Body Slam+, Uppercut+, Dark Embrace+, or key cost reductions can change entire fights
Build defense before greed	Corruption + Dark Embrace + Feel No Pain is powerful because it creates draw, block, and card flow, not because each card is good alone
Use potions to protect upgrades	spending a potion to avoid resting can be worth more than saving it for a fantasy boss turn
Stop adding medium attacks	high difficulty punishes decks that cannot find their best cards on time

The strongest high Ascension Ironclad decks usually have a compact plan: fast Act 1 damage, enough block to survive setup, and one engine that actually wins long fights. Corruption + Dark Embrace + Feel No Pain is one of the cleanest examples when the support is real, but it still needs draw, removal, and enough immediate safety to get the powers in play.

Act-by-Act Ironclad Plan

Act 1: Build the Foundation

Act 1 Ironclad wants controlled aggression.

Priorities:

1. take 2-3 real attacks
2. improve Vulnerable uptime
3. get one block/card-flow tool
4. use potions to secure elites
5. upgrade a card that changes breakpoints
6. avoid taking every medium attack after damage is solved

Good early picks include Pommel Strike, Headbutt, Shrug It Off, Uppercut, Whirlwind, Molten Fist, Break, and Thunderclap.

Act 1 is not where you force Demon Form, Corruption, Barricade, and Rupture all at once. Pick a scaling direction only after the deck can survive.

Act 2: Choose the Real Engine

Act 2 punishes “attacks plus hope.”

By now you need one of these:

• Strength engine
• Exhaust engine
• Body Slam/block engine
• Bloodletting/Rupture engine
• strong Vulnerable payoff engine
• enough burst plus draw to end fights quickly

Your Act 2 priorities are:

Problem	Fix
fights last too long	add scaling or a finisher
dangerous turns force rests	add block, Weak, or relic support
key cards appear too late	remove, draw, or stop adding filler
deck has too many paths	commit to the strongest supported one
boss plan is unclear	draft for the boss, not for more Act 1 damage

Boss Fights: Prove the Build Works

A boss-ready Ironclad deck needs more than damage.

Ask:

• Can I survive the setup turn?
• Can I draw my scaling before the fight is half over?
• Can I block while setting up Strength, Exhaust, or Barricade?
• Can I convert Vulnerable into a real damage window?
• Do I have a potion for the turn my deck is weakest?
• Does my deck still work if the key card is near the bottom?

If the answer is no, the issue probably happened earlier: too many medium attacks, too few removals, no draw, or a scaling package with no defense.

Ironclad in Co-op

Ironclad’s co-op role is simple: turn Vulnerable into a team-wide damage multiplier. In solo, Bash, Thunderclap, Uppercut, Break, and Molten Fist improve your own damage. In co-op, they improve the whole team’s damage, so Ironclad often creates more value by enabling teammates than by chasing personal overkill.

A good co-op Ironclad usually does three things:

1. keeps Vulnerable available for team burst turns
2. stabilizes early fights with frontloaded damage
3. chooses one late-game role, such as Strength carry, Exhaust engine, or frontline support

Do not rebuild the entire multiplayer strategy inside this article. For team roles, revive rules, co-op-only cards, map voting, and communication habits, read the Slay the Spire 2 Co-op Guide.

When to Skip Ironclad Cards

Ironclad’s biggest beginner trap is taking too many attacks.

Skip a card when:

• it is another medium attack after damage is solved
• it needs an upgrade you cannot spare
• it belongs to an archetype you do not actually have
• it makes your best cards harder to draw
• it does not help the next elite, boss, or route
• it adds HP cost without payoff or recovery
• it duplicates scaling instead of solving defense/card flow

For a deeper breakdown, read When to Skip Cards in Slay the Spire 2.

Common Ironclad Mistakes

Mistake	Better habit
Taking every attack	stop once Act 1 damage is solved
Forcing Strength too early	add Strength after the deck can block/setup
Taking Exhaust payoffs without Exhaust	draft enablers first
Taking Body Slam with no block engine	wait for real block density or relic support
Treating Burning Blood as infinite HP	spend HP only for power
Ignoring Vulnerable	use it to turn attacks into tempo
Chasing old infinite lines blindly	check current Early Access patch behavior
Avoiding elites forever	use Burning Blood, potions, and upgrades to take prepared elites

Final Ironclad Checklist

Before leaving Act 1, ask:

• Do I have 2-3 real attacks beyond starter Strikes?
• Do I have reliable Vulnerable or a reason not to?
• Can I fight at least one prepared elite?
• Do I have one strong upgrade target?
• Am I using Burning Blood’s 6 HP heal to buy power, or just bleeding?
• Do I know my likely scaling direction?

By Act 2, ask:

• Is my deck Strength, Exhaust, Body Slam, Bloodletting, Vulnerable payoff, or burst?
• Do I have enough draw/removal to find key cards?
• Can I block while setting up?
• Have I stopped adding medium attacks?
• Does my deck actually beat bosses?