The GM is encouraged to create their own Legendary actions for specific campaigns or settings. These however are the base Legendary Actions.
Free
When you fail your death saving throws, you can instead come back with <your level> + <your hit die, rolled> amount of hitpoints. You can only this once per 48 hour
Free
You re-roll any D20 dice
Free
You automatically succeed a check against a frightened effect.
Reaction
You make an attack action, taking into account MAP.
Free
You give an ally 1D6 to their next D20 roll.
Free, Emboldened Only
Your next attack roll to crit is reduced by 3.
Free, Desperation only
You ignore MAP until the end of your turn.
Reaction, Emboldened Only
You gain +5 to a will saving throw
Reaction, Emboldened Only
You gain a +5 to your next dexterity saving throw
Free, desperation only
You gain a +5 to your next fortitude saving throw
Free, desperation only
You gain +5 to your next will saving throw
Free, desperation only
Automatically succeed a saving throw.
Free
Determine any of your D20 roll or set someone’s D20 roll to a value of 10 - D4(you roll)
Action, Desperation only
You gain a spell slot of a level equal to your highest up to level 6 spell slot.\
Action, Emboldened only
Your next spell gains a +5 to spell DC or attack roll.