Alvadore Alvoretum's Disco Ball

Splinter Possibility Space. Alvadore's Disco ball can alter the timeline and splinter possibilty space to their advantage. As a reaction, the wielder can expend a use of the disco ball to roll an additional d20 after any attack roll, ability check, or saving throw, and choose which of the two rolls are used for the resulting event.  If the original roll has advantage, the wielder rolls its d20 after the advantage or disadvantage has been applied to the original roll.

This ability can technically only be used twice - on the third time, the dico ball will be depleted and rendered inert until it can be recharged by a celestial being of power equivalent to Alvadore Alvoretum.