Boon of Legendary Actions (5e Epic Boon)
From D&D Wiki
Boon of Legendary Actions
You gain 1 Legendary Action. A Legendary Action can be used at the end of another creature's turn. Spent Legendary Actions are regained at the start of each turn. You can forgo using them, and you can’t use them while Incapacitated or otherwise unable to take actions. If surprised, you can’t use them until after your first turn in the combat.
- Attack: You make one Attack.
- Move: You move up to half your speed.
- Cast: You cast a spell with a casting time of a bonus action or reaction, or a cantrip with a casting time of one action.
You can take this boon more than once, up to 3 times. Each time you take it after the first, you gain an additional Legendary Action. Only one Legendary Action can be used at a time.
- If you have more than 1 Legendary Action, you can spend 2 Legendary Actions to cast a spell of 1st level or higher with a casting time of one action.