Amulet of Luck

Whenever you make an attack roll, an ability check, or a saving throw, you can activate this item to roll an additional D20. You can activate this item after you roll the die, but before the outcome is determined. You choose which of the d20s is used for the attack roll, ability check, or saving throw.

You can also activate this item when an attack roll is made against you. Roll a D20 and then choose whether the attack uses the attacker's roll or yours.

If more than one creature uses luck to influence the outcome of a roll, the points cancel each other out; no additional dice are rolled.

This amulet can only be used once per long rest. 

Notes: Bard, Wizard, Sorcerer, Warlock or Cleric