Intermediate

Co-Op Multiplayer

Team up with up to 4 players and conquer the Spire together

co-opmultiplayercoordinationparty

How Co-Op Works

A major game-changing addition has arrived with Slay the Spire 2. For the first time, players can team up and combine their strengths to tackle the Spire together. Party size supports up to 4 players. During Early Access, co-op requires friends list only — no matchmaking is available.

Key Mechanics

Mechanic	Description
Enemy Health	Scaled to party size
Boss Mechanics	Enhanced defenses (e.g., Vantom requires double attacks to break Slippery)
Damage Distribution	Enemies hit ALL players with each attack
Simultaneous Turns	All players act at the same time — coordination is critical

Turn Coordination

Since everyone plays simultaneously, communication is essential.

Coordination tips

•Wait for your ally to apply Vulnerable before playing your big attacks
•Coordinate Block timing against multi-hit enemy attacks
•Plan Energy usage to avoid wasting buffs

Rest Sites in Co-Op

Your rest site gains a new option: Mend. This allows you to heal another player instead of yourself.

Strategic uses of Mend

•Bringing an ally back from the brink of death
•Allowing a teammate to take the Upgrade option instead of healing themselves

Relic Distribution

During chest events, your party is offered Relics equal to the number of players present. Each player chooses which Relic they want. If multiple players want the same Relic, a Rock Paper Scissors mini-game decides the winner — the winner takes the chosen Relic, and the loser receives a different Relic at random.

Shared Resources

Some Potions (Block Potion, Energy Potion) can be played on yourself OR a party member, making your potion pool somewhat party-wide. At any time you can inspect your allies' Relics, Potions, and Deck List. Note: you cannot view their current hand during combat. The top-left corner shows each ally's Health, Cards in hand, and Energy — use this to coordinate plays!

Co-Op Exclusive Cards

These cards only appear in multiplayer runs and offer unique party-wide benefits.

Ironclad

Card	Effect
Demonic Shield	Lose 1 HP. Give another player Block equal to your Block

Silent

Card	Effect
Flanking	The enemy takes double damage from other players this turn
Sneaky	Whenever another player attacks an enemy, gain 1 Block

Regent

Card	Effect
Largesse	Another player adds 1 random Colorless card to their hand

Necrobinder

Legion of Bone grants the Summon mechanic (giving Osty) to ALL party members, even those who normally can't use it — opening powerful synergies for multi-Necrobinder compositions.

Card	Effect
Glimpse Beyond	ALL players add 3 Souls into their draw pile. Exhaust
Legion of Bone	ALL players Summon 6. Exhaust

Defect

Card	Effect
Energy Surge	ALL players gain 2 Energy. Exhaust
Ignition	Another player Channels Plasma

Colorless

Card	Effect
Beacon of Hope	Whenever you gain Block on your turn, other players gain half that much Block
Believe in You	Another player gains 3 Energy
Coordinate	Give another player 5 Strength this turn
Gang Up	Deal 5 damage. Deals 5 additional damage for each time another player has attacked the enemy this turn
Intercept	Gain 9 Block. Redirect all incoming attacks that would hit another player this turn to you
Knockdown	Deal 10 damage. The enemy takes double damage from other players this turn
Lift	Give another player 11 Block
Mimic	Gain Block equal to the Block on another player. Exhaust
Rally	ALL players gain 12 Block
Tag Team	Deal 11 damage. The next Attack another player plays on the enemy is played an extra time

Co-Op Strategies

Multiplayer changes the strategic landscape significantly.

Debuff Coordination

Debuffs like Weak and Vulnerable need only be applied by one player but benefit the entire party. This dramatically increases their value. Consider having at least one party member focus on a support role — something rarely viable in solo play.

Self-Defense is Still Critical

While you can lean on teammates for offense, you're still responsible for your own protection. Having solid Block options remains essential. You can't rely on allies to save you from every attack.

Relic Synergies

Miniature Tent becomes incredible in Co-Op due to the Mend option. Your ally can be brought back from near-death with a double heal, or get a critical Upgrade because they didn't need to Rest.