Mercurius
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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 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 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 Rooms and 
Shops on the first floor, 
Sacrifice Rooms, etc.) or have been entered before.
Mini-Boss Rooms, despite looking identical to normal rooms, are considered Special and will not be opened. This makes it possible to distinguish between regular rooms and mini-boss rooms without map-revealing effects (such as 
The Compass).
- Does not open doors to
Red Rooms if those doors are created while there are enemies inside the current room.
Synergies
4.5 Volt / 
Jumper Cables: Provides infinite charges by clearing some enemies then leaving the room, and repeating.
Camo Undies: Allows the player to go through rooms at a quicker pace due to the invisibility.
Charm of the Vampire / 
Leech: Allows for unlimited healing.
Gimpy / 
Sharp Straw: Allows the possibility to generate unlimited Hearts.
Head of the Keeper: With enough patience, Coins can be gathered infinitely.-
Tainted Keeper: Leaving and re-entering the room allows for unlimited coin farming; however, enemies in rooms Tainted Keeper has already visited will eventually stop dropping coins.
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.
 Astrological Signs
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| Items |
 The Binding of Isaac: Rebirth
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