Slay the Spire 2 Elite Guide: All 12 Elites and When to Fight Them

Elites Are How You Win Runs

Hallway fights give you cards. Bosses give you a win condition check. But elites give you relics — and relics are the biggest power spikes in any run. A deck with 4 relics from aggressive elite pathing has a fundamentally different ceiling than a deck with 1.

The trick is knowing when to fight and when to walk away. Not every elite is worth the HP cost, and some are run-ending traps if your deck isn’t ready. I’ll break down all 12 and give you the information to make that call.

The Fight-or-Skip Decision

Three variables: your HP, your deck quality, and what comes after.

Act 1: Fight at 60%+ HP with at least one good damage card. The relic payoff is highest here because you benefit from it for the entire remaining run. Target 2-3 elite fights.

Act 2: Fight at 50%+ HP with a forming archetype. Act 2 elites are meaningfully harder. If your deck still feels like a random pile, skip elites and spend gold at shops. Target 1-2 elite fights.

Act 3: Fight at 40%+ HP with a fully assembled deck. Act 3 elites are borderline bosses. The relic helps less because fewer fights remain. Only fight if you’re confident and the relic could impact the final boss. Target 0-1 elite fights.

Act 1a: Overgrowth Elites

Bygone Effigy

Sleeps for 2 turns. Completely passive — does nothing while asleep. After waking, punishes you hard. Every card you played on previous turns contributes to a stacking damage effect. The more cards you’ve played throughout the fight, the harder the Effigy retaliates.

Strategy: Use the 2 sleeping turns to set up Powers and draw through your deck. Once it wakes, limit yourself to 2-3 card plays per turn to keep the retaliation manageable. Burst it down fast — every additional turn increases the punishment.

Best approach: Kill it in 1-2 turns after waking. Ironclad Strength builds and Silent burst poison both handle this. Defect can stack orbs during sleep and let passive damage finish the job.

When to skip: Your deck has no burst damage and relies on playing 5+ cards per turn. The Effigy’s retaliation will scale past what you can block.

Byrdonis

Gains Strength at the end of every turn. No tricks, no phases. It just hits harder and harder. Turn 1 is a manageable hit. Turn 5 is 30+ damage.

Strategy: Race it. You need to kill Byrdonis in 3-4 turns or the Strength stacking makes its attacks unblockable. Weak application (Bash, Neutralize) is your best defensive tool because it directly reduces the escalating damage.

When to fight: You have strong early damage and a Weak source. This is a clean fight if you can kill it fast.

When to skip: Your deck is defensive-focused with no burst. Blocking scales linearly; Byrdonis’s Strength scales exponentially. You lose the math eventually.

Phrog Parasite

Spawns Wrigglers (small add enemies) and adds Infection cards to your deck. The Wrigglers are annoying but low-threat individually. The Infections clog your draws.

Strategy: Kill the Phrog first — Wrigglers die when it dies. Bring enough damage to end the fight in 4-5 turns before Infections pollute your deck. Card draw helps cycle past Infections. Exhaust effects remove them permanently.

Ironclad tip: True Grit exhausts Infections while blocking. Burning Pact draws 2 while exhausting a card — use it on an Infection.

When to skip: Your deck is already bloated with 25+ cards and can’t afford more junk. The Infections will reduce your consistency at the worst possible time.

Act 1b: Underdocks Elites

Phantasmal Gardener

Summons plant minions that complicate the fight. The Gardener itself isn’t the primary damage source — the adds are.

Strategy: If you have AoE (Whirlwind, Crippling Cloud, Electrodynamics), clear adds while damaging the Gardener simultaneously. If your deck is single-target, ignore the adds entirely and burn the Gardener down. Adds die when the summoner falls.

When to fight: You have any form of AoE damage, or your single-target damage is high enough to race the Gardener before adds overwhelm you.

When to skip: Your deck is low on both AoE and single-target damage. The adds will chip you down while you slowly work through the Gardener’s HP.

Skulking Colony

The damage cap enemy. Hardened Shell prevents the Colony from losing more than 20 HP in a single turn, regardless of your actual damage output. Your 80-damage Heavy Blade? Still only removes 20 HP.

Strategy: This fight takes a minimum of 4-5 turns no matter what. Plan for a marathon, not a sprint. Consistent mid-range damage (15-20 per turn) is just as effective as massive burst. Focus on sustainable defense.

Poison and Doom work differently here — they can bypass the damage cap mechanics. Block-heavy builds outperform glass cannons in this specific fight.

When to fight: You have consistent defense and don’t rely on burst damage. Poison or Doom builds actually prefer this elite because the cap doesn’t affect them the same way.

When to skip: You’re a glass cannon with no Block generation. Five turns of sustained incoming damage will drain you even if you deal max damage each turn.

Terror Eel

Raw damage. One of the most dangerous Act 1 elites in terms of hit-per-turn numbers. Can apply debuffs that reduce your defensive capability.

Strategy: Prioritize Block for the first 2-3 turns. The Eel’s damage is frontloaded. Survive the spike, then stabilize and counterattack. Weak application is incredibly valuable.

When to fight: You’re above 60% HP and have Weak application or strong Block generation. The relic reward is worth the HP cost if you can survive cleanly.

When to skip: Below 50% HP with no Weak in your deck. The Eel can hit for 25+ in a single turn early on. One bad draw and you’re dead.

Act 2: Hive Elites

Act 2 elites are where the difficulty ramps. These are not slightly-harder hallway fights — they’re mini-bosses that demand a functional deck.

Decimillipede

Multi-hit enemy. Attacks multiple times per turn, and you need Block to cover the total, not just one hit. If the Decimillipede attacks 4 times for 8 damage each, that’s 32 total Block needed.

The community has complaints about this one for good reason. Multi-hit attacks punish low-Block decks disproportionately, and the total damage per turn is high.

Strategy: Dexterity-based defense is the answer. Footwork gives the per-card Block increase needed to cover multi-hit barrages. Wraith Form’s Intangible reduces each hit to 1, making the multi-hit irrelevant. Frost orbs with Focus handle this well for Defect.

When to fight: You have strong per-turn Block generation or Intangible access. The fight is manageable with proper defense.

When to skip: Your Block generation tops out at 15-20 per turn. The Decimillipede will hit through that every single turn and bleed you dry.

Entomancer

Summons insect minions that buff each other and debuff you. The swarm is the threat, not the summoner itself.

Strategy: AoE solves everything. Whirlwind, Noxious Fumes, Electrodynamics — any of these trivialize the fight by clearing minions while hitting the Entomancer. Without AoE, focus the Entomancer directly. Minions die when it falls.

When to fight: You have AoE or enough single-target damage to kill the Entomancer before the swarm scales.

When to skip: No AoE and mediocre single-target. The minion buffs stack, and a full swarm with 3+ buffs each will overwhelm you.

Infested Prism

Defensive elite that reflects or reduces damage. Standard attacks feel weak because of damage reduction mechanics.

Strategy: Bypass its defenses. Poison, Doom, and direct HP loss effects ignore Block and armor. For attack-based decks, apply Vulnerable first to maximize every hit through the damage reduction. Chip away methodically.

When to fight: Poison, Doom, or Vulnerable-based decks. These ignore or mitigate the Prism’s defenses entirely.

When to skip: Pure attack-based deck with no Vulnerable application or defense-piercing effects. You’ll spend 8 turns tickling it while taking real damage.

Act 3: Glory Elites

These are boss-tier fights. Only engage with a completed, polished deck. The relic reward matters less because you have fewer fights to benefit from it.

Knight Trio

Three enemies: Flail Knight (attacker), Spectral Knight (buffer/support), and Magi Knight (caster). They complement each other — the buffer strengthens the attacker while the caster applies debuffs.

Strategy: Kill Spectral Knight (the buffer) first. Removing buffs weakens the other two immediately. AoE damage hits all three simultaneously and is the fastest path to victory. Without AoE, target order is: Spectral > Flail > Magi.

This fight is long without AoE. Bring potions and expect to take some damage.

When to fight: Strong AoE or enough single-target to kill one knight per 2-3 turns. Your deck needs to handle multi-enemy pressure.

When to skip: Almost always worth skipping at low HP. Three enemies means three sources of damage per turn. The margin for error is tiny.

Mecha Knight

Single high-HP enemy with heavy armor and 30-40 damage swings. Straightforward but lethal. No mechanics, just numbers.

Strategy: Scaling damage is mandatory. Flat damage bounces off the armor. Strength builds, poison stacking, Doom, or high-Focus orbs are the ways through. Vulnerable amplifies everything by 50%, which matters against this much HP and armor.

Block aggressively on attack turns. One unblocked hit takes a third of your HP.

When to fight: Your scaling engine is online and you have Vulnerable application. The fight is clean if your numbers are high enough.

When to skip: Your deck plateaued at mid-level damage. If you can’t break through the armor consistently, you’ll take too much damage for the relic to matter.

Soul Nexus

The most complex Act 3 elite. Adapts to your play patterns. Consistent attacking triggers counters. Consistent blocking gets bypassed. It reads what you’re doing and punishes repetition.

Strategy: Alternate offense and defense. Cards that provide both (Flame Barrier, Glacier) are ideal. Read intent icons and react rather than following a fixed plan. Versatile decks handle this better than hyper-specialized ones.

When to fight: Your deck has both offensive and defensive options, and you’re comfortable reading intents and adapting on the fly.

When to skip: You’re running a one-dimensional deck (pure offense or pure defense). Soul Nexus will exploit whatever you’re missing.

Elite Pathing Summary

Here’s my general approach to elite routing:

• Act 1: 2-3 elites. Fight aggressively. Relics earned here carry you through the entire run.
• Act 2: 1-2 elites. Be selective. Only fight elites that your deck can handle without losing 40%+ HP.
• Act 3: 0-1 elites. The boss is what matters. Only fight an elite if you’re healthy, confident, and the relic directly helps your boss matchup.
• Always check the map for rest sites after elites. Having a heal available after a tough fight makes aggressive pathing much safer.
• Potions exist for elites. A Strength Potion on an elite is worth more than saving it for a hallway fight. Use them.