Binding of Isaac: Rebirth Wiki
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(in Repentance)

Mercurius is a passive item added in The Binding of Isaac: Repentance.

Effects[ | ]

  • +0.4 speed.
  • Opens most doors after entering a room, even in rooms with enemies, allowing Isaac to leave at any time.

Notes[ | ]

  • While Door StopDoor Stop has a similar effect, Mercurius has the added benefit of opening the doors that Isaac did not enter through.
  • Does not open the Boss RushBoss Rush door.
  • Does not open any Special Rooms, including those that require pickups to unlock. Doors won't be opened even if they were open already (such as Treasure RoomTreasure Rooms and ShopShops on the first floor, Sacrifice RoomSacrifice Rooms, etc.) or have been entered before.
  • Does not open doors to Red RoomRed Rooms if those door are created while there are enemies inside the current room.

Synergies[ | ]

  • Collectible 4.5 Volt icon4.5 Volt / Collectible Jumper Cables iconJumper Cables: Provides infinite charges by clearing some enemies then leaving the room, and repeating.
  • Collectible Charm of the Vampire iconCharm of the Vampire / Collectible Gimpy iconGimpy: Allows the possibility to generate unlimited Hearts.
  • Collectible Head of the Keeper iconHead of the Keeper: With enough patience, Coins can be gathered infinitely.
  • Character Tainted Keeper iconTainted Keeper: Leaving and re-entering the room allows for limited coin farming; however, enemies in rooms Tainted Keeper has already visited will eventually stop dropping coins.
  • Collectible Camo Undies iconCamo Undies: Allows the player to go through rooms at a quicker pace due to the invisibility.

In-game footage[ | ]

Trivia[ | ]

  • Mercurius originates from the Antibirth mod.
  • Mercurius' effects reference the Roman god of travel and communication, Mercury, who wore winged shoes and a winged hat.
  • Mercurius is the biggest static speed upgrade in the game.
  • Despite Mercurius preventing doors from closing, the sound of doors opening can still be heard after clearing a room with enemies.


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