Slay the Spire 2 Best Builds: 3 Loadouts That Actually Win Runs

I deleted my first 15 runs of StS2. Not exaggerating. I was drafting cards like I did in the original, and the game kept handing me my own teeth. The early access balance is different — enemies hit harder in Act 1, elites show up earlier on the map, and the new Ancients system means you can't just hoard boss relics and coast.

After a lot of trial and error (emphasis on the error), three builds started clicking. These aren't theorycrafted — I've taken each one through A15+ and they hold up. If you're stuck in the Act 2 death spiral, pick one of these and commit to it early.

Ironclad Exhaust Engine

Everyone talks about Strength scaling on Ironclad. It's fine — Heavy Blade plus Limit Break still works. But the exhaust engine is what actually wins runs consistently.

The idea sounds wrong at first. Why would you want to delete your own cards mid-combat? Here's why: Corruption makes all your skills cost zero. Dark Embrace draws a card every time you exhaust something. Feel No Pain gives you 3 block per exhaust. Once all three are in play, every skill you draw is free energy, plus card draw, plus block.

I've had turns where I played 15 cards in a row without spending a single energy. Against the Act 3 boss I just cycled through my whole deck twice in one turn.

Core picks: Corruption, Dark Embrace, Feel No Pain. After that you want Shrug It Off and True Grit — they're skills so they go free with Corruption, and True Grit lets you exhaust the Strikes you haven't removed yet. For damage, Body Slam scales off your block, and with Feel No Pain you'll have plenty. Second Wind is a hidden MVP — it exhausts all non-attack cards in your hand and gives block per card. With Dark Embrace out, that's block plus a fresh hand.

Relics to hunt: Dead Branch turns every exhaust into a random card. It's chaotic but almost always wins. Medical Kit lets you exhaust status cards too.

One thing I learned the hard way: don't take Runic Pyramid with this build. Your hand fills up with cards you can't play and you stop drawing. Sounds obvious now, but I lost a winnable run to that mistake.

Silent Discard Cycling

Poison is still strong — Noxious Fumes plus Catalyst hasn't changed. But the build I keep coming back to is discard cycling.

Prepared plus Tactician is the engine. Prepared draws 2 and discards 2. Tactician gives you 2 energy whenever it's discarded. Reflex draws 3 when discarded. If you get even one Tactician and one Reflex in rotation, your turns get stupid long. I've had the Silent generating 7 energy per turn from discards alone.

For actual damage you want Eviscerate — it costs 3 but drops by 1 for each card discarded this turn. In a discard cycle you're discarding 4-5 cards per turn so it's basically free. Sneaky Strike is similar, refunds its cost if you've discarded anything. And Acrobatics is just 3 draw plus a discard for 1 energy, keeps the engine running.

The tricky part is surviving Act 1. Discard synergy needs pieces before it clicks. Take damage commons early — Dagger Throw, Quick Slash, anything that says "draw" or "discard" so you're building toward the engine. Don't pass up a Backflip just because it doesn't discard; you need block while you assemble.

Key relics: Hovering Kite gives you 1 energy each turn you've discarded a card. Tough Bandages give 3 block per discard — free block every cycle. Bandolier triggers on your third attack each turn, which happens a lot in discard loops.

Necrobinder Soul Bomb

Necrobinder is the new kid and people are sleeping on her. Her mechanic is Souls — every enemy kill grants 1-3 Souls based on the enemy's HP, and certain cards consume Souls for massive effects. She's one of the two new characters alongside Regent in StS2.

The Soul Bomb build centers on one interaction: Soul Harvest plus Reap. Soul Harvest is a 2-cost attack that deals 8 damage and stores Souls equal to the unblocked damage dealt. Reap consumes all stored Souls and deals that much damage to all enemies, twice.

Here's how it plays. Act 1 you're weak — mostly just harvesting Souls from hallways and trying not to die. By mid-Act 2 you've got 30-40 Souls banked and Reap becomes a screen clearer. In my best run I hit the Act 3 boss with Reap for 84 damage to all enemies, twice, on turn 3. Fight was over.

Core: Soul Harvest, Reap, Soul Siphon (1-cost skill, heal 4 per Soul consumed — your sustain engine). Wraith Stance (power, all attacks generate +1 Soul) is premium. Death Mark (2-cost, all enemies take 50% more damage from Soul-consuming attacks) turns Reap nuclear.

Weakness is obvious — you need to stack Souls before you do anything, so fast enemies wreck you. Gremlin Nob in particular — you're playing skills to generate Souls and he's gaining Strength each time. Bring a damage potion or avoid Act 1 elites.

Relics: Soul Lantern (start each combat with 5 Souls), Phylactery (when you'd die, instead consume all Souls and survive on 1 HP), Cursed Hourglass (Soul-consuming attacks deal 3 extra damage per Soul).

I won't pretend these are the only viable builds. Regent's Quest system is a whole other thing — complete objectives mid-run for permanent bonuses — and the Defect still has its orb nonsense with over 570 cards to play with. But when I want to actually win a run instead of messing around, I pick one of these three and stick to it.