Abacus is a trinket in Brown Shapiro's Addons, a mod for The Binding of Isaac.
In hostile rooms, shooting exactly 5 tears before stopping grants +0.25 fire rate for the current room.
It stacks with no limit.
The following special synergies and interactions for Abacus have been documented.
Mod | Item | Synergy |
---|---|---|
--- | Trinket multipliers | +0.25 fire rate per multiplier each time it stacks. |
* Note that not all possible synergies and interactions are listed here.