Slay the Spire Tier List: Ranking Every Character at Ascension 20

Slay the Spire has four characters. Four. Most tier lists need a spreadsheet. This one needs a barstool and a strong opinion.

But four characters doesn't mean a simple ranking. Each character in Slay the Spire has multiple viable archetypes, hundreds of cards, dozens of relics, and an Ascension ladder that makes the game harder in twenty different ways before you reach the ceiling. Ranking characters at Ascension 0 is meaningless — everything works at low difficulty. Ranking them at Ascension 20 is where the hierarchy reveals itself, because A20 is the difficulty where marginal advantages compound into the difference between a win and a loss at Ante 3.

This tier list ranks every character at Ascension 20, which is the hardest standard difficulty. If you're climbing toward A20, these rankings preview what matters when the game stops being forgiving. If you've already beaten A20 with everyone, you probably have opinions about this list. You're welcome to disagree. Watcher players always do, because they think being S-tier means their character is harder to play, when actually it means the character is so strong that even imperfect play produces wins.

Quick note: this is for Slay the Spire 1. STS2 launched in Early Access with five characters and a shifting meta — we cover that in a separate tier list. The original game hasn't been patched in years. The meta is settled. What follows is the final word, or at least the final argument.

The Character That Shouldn't Exist (S Tier)

Watcher

The Watcher broke the game and everyone knows it. Her Stance mechanic — shifting between Wrath (double damage dealt and received) and Calm (gain energy on exit) — creates a resource engine that no other character can match. Enter Wrath. Deal double damage. Exit to Calm. Gain energy. Use the energy to set up the next Wrath entry. Repeat until the enemy is dead, which doesn't take long because you're hitting for double damage every other turn.

The community's A20 win rates consistently put Watcher on top. Streamers win more with Watcher than any other character. Speedrunners use Watcher. Tournament players default to Watcher. The character is the consensus best and has been since she was added in January 2020.

What makes Watcher truly S-tier isn't just the Stance engine. It's the archetype flexibility. Wrath/Calm is the most common build, but Watcher also supports Divinity builds (absurd burst damage when you hit the Divinity stance), Retain builds (keeping key cards between turns), and the infamous infinite combo decks that loop through the draw pile every turn. Most characters have one or two viable archetypes. Watcher has four, and three of them are among the strongest strategies in the entire game.

The drawback — taking double damage in Wrath — sounds like a balancing factor. In practice, the double damage you deal kills enemies fast enough that the double damage you receive is irrelevant. Dead enemies don't attack. Watcher solves the defense problem by solving the offense problem so thoroughly that defense becomes optional.

Blasphemy deserves its own paragraph. The card kills you at the end of your next turn but gives you Divinity stance immediately. The correct play is to deal lethal damage before the turn ends. The incorrect play is dying. There is no middle ground. Blasphemy is the most exciting card in the entire game, and using it correctly is the highest-skill expression of any character's toolkit.

Silent

The deepest character in the game. Where Watcher wins through explosive power, Silent wins through options. Poison builds that melt bosses over ten turns. Shiv builds that produce twenty attacks per turn. Infinite discard loops that draw the entire deck every turn. Defensive builds using Wraith Form to become intangible. No other character can approach a given run from as many angles.

Silent has the lowest starting HP (70), which means early-game mistakes are more punishing. She also has no innate healing, unlike Ironclad's Burning Blood. These drawbacks force better play — you have to be smarter about pathing, elite fights, and early card picks. The community consensus is that Silent rewards deep knowledge of the game's mechanics more than any other character. A new player's Silent is probably the weakest character. A thousand-hour player's Silent is arguably the strongest.

Noxious Fumes, Footwork, and Wraith Form are the three cards that define Silent's identity. Fumes provides passive poison that scales over long fights. Footwork provides block scaling that makes every block card better. Wraith Form provides three turns of invulnerability that let you ignore damage entirely. Any two of these three in a deck creates a viable A20 strategy. All three together is among the most reliable A20 win conditions in the game.

The argument for Silent over Watcher as the true #1 is consistency. Watcher has higher highs but more run-ending variance (a bad Wrath entry at the wrong time can kill you). Silent has lower highs but steadier results. The community leans Watcher. We lean Watcher too. But the gap is smaller than tier placement suggests.

The Characters That Get the Job Done (A Tier)

Ironclad

The starting character. The tutorial. The one most players assume is basic, which is true in the same way that a reliable truck is basic — it's not exciting, it always works, and it'll outlast anything flashier.

Ironclad has four distinct archetypes, which is tied with Watcher for the most in the game. Strength builds (Demon Form, Limit Break, Heavy Blade) that turn the late game into a damage calculator. Exhaust builds (Corruption, Feel No Pain, Dark Embrace) that throw away cards for benefits. Barricade Block builds that stack block between turns until nothing can hurt you. Self-Damage/Rupture builds that gain strength by hurting yourself. Four archetypes means Ironclad can adapt to almost any card offering sequence.

80 starting HP — the highest of any character. Burning Blood heals 6 HP after every combat. These two facts alone make Ironclad the most forgiving character for aggressive pathing. You can fight more elites, take more risks in events, and survive more bad draws than any other character in the early game. Elite farming is how you get strong in Slay the Spire, and Ironclad is the best early-game elite farmer.

The reason Ironclad is A-tier and not S-tier: his ceiling is lower than Watcher's or Silent's. A perfect Ironclad run is very strong. A perfect Watcher run breaks the game. That ceiling gap is the entire tier difference.

Defect

The polarizing one. When Defect works, it really works. When it doesn't, you're staring at a hand full of orb cards with no orbs channeled, wondering where the run went wrong.

Defect's orb system — Lightning (damage), Frost (block), Dark (delayed nuke), Plasma (energy) — creates a unique resource management layer that no other character has. The best Defect cards are among the best cards in the game. Echo Form doubles your first card each turn. Biased Cognition gives +4 Focus immediately (Focus increases orb effectiveness) with a drawback that takes several turns to matter. Glacier provides both Frost orbs and block simultaneously. These cards, when they show up, produce runs that feel effortless.

The problem is "when they show up." Defect's card pool is more specialized than the other characters'. A bad Ironclad deck can still kill things by hitting them with a sword. A bad Defect deck can't generate enough orbs to do anything meaningful. The character's floor is the lowest in the game, which means more lost runs from bad draws, bad paths, and bad luck.

At A20, Defect requires genuine understanding of orb mechanics, energy management, and focus scaling. Players who have that understanding find Defect rewarding. Players who don't find Defect frustrating. Both experiences are valid. The character is good. It's just less forgiving about mistakes than anything else in the roster.

Fission deserves a mention. Pound for pound, removing all your orbs to gain energy and card draw is considered by some community members to be the single most powerful card in the game — on a standalone basis. Whether you agree depends on how much you value standalone power versus synergy, and that argument has been running for five years.

The Actual Takeaway

Four characters. All viable at A20. The ordering is Watcher > Silent > Ironclad > Defect, and the community has agreed on this for years. What the community hasn't agreed on — and won't — is whether the gap between tiers is large or small.

The Watcher camp says the gap is large. Watcher's Stance engine produces damage numbers that no other character can match, and the archetype flexibility means bad runs are rarer. The Silent camp says the gap is small. Silent's deeper card pool means more viable paths through any given run, which reduces the impact of RNG. The Ironclad camp says they don't care about tier lists because Ironclad always wins eventually. The Defect camp says Fission is the best card in the game and everyone else is wrong.

All four camps are partly right. That's the beauty of a four-character roster where every character is viable — the tier list is less about "who's good" and more about "who's good in what ways." If you're climbing to A20, start with Ironclad (most forgiving), then Silent (most flexible), then Watcher (most powerful), then Defect (most rewarding). That order lets each character teach you something the previous one didn't.

Slay the Spire is available on Steam. If you're into deckbuilders that reward deep system knowledge, it's the game that defined the roguelike deckbuilder — and if you want our take on the genre, Granny's Gambit is our Victorian deckbuilder, free on itch.