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Co-op bullet heaven roguelike for 1-4 players with a twist: one player controls the monsters. Survive the hordes OR become the Grimoire Master who spawns the swarm and pilots bosses against your friends. Which side are you on?
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Match strength key:80+65+50+<50Grimoire of Monsters
SteamAbout Grimoire of Monsters
CO-OP BULLET HEAVEN WITH A LIVE GRIMOIRE MASTER
Grimoire of Monsters is a co-op action roguelike for 1–4 players. Most of you fight to survive. One of you is the reason it's hard.
Team up with friends and fight through huge waves of enemies. Pick up new spells, build powerful combos, revive each other, and take down giant bosses. Or play as the Grimoire Master and become the threat: send in monsters, twist the battlefield, take control of bosses, and ruin every plan the party has.
Every run is a fight between the team's spell combos and the chaos the Grimoire Master throws back at them.
SURVIVE AS THE PARTY
Every run is a race to build something powerful before the monsters catch up.
BECOME THE GRIMOIRE MASTER
You do not fight the monsters. You are the monsters.
The Grimoire Master decides when things calm down, when they get scary, and when the party has a really bad day. Every run feels different depending on who is playing this role.
PLAY ONLINE OR ON THE SAME SCREEN
Grimoire of Monsters is built for playing together on one shared screen.
At home, phones can be used as extra controllers, so anyone can join without needing more gamepads.
Friends far away? Stream the session with Steam Remote Play Together, and only the host needs to own the game.
Short on players? Bots fill the empty seats.
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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