Achilles Heel

Legendary Action.

Achilles Heel (Costs 2 actions) Cause one player temporary invulnerability at the loss of 1 action per turn, This will allow them to roll a saving DC16 fortitude check every time you attack them, if they fail this check you hit their Achilles Heel dealing 10d10 damage, however if they succeed their roll they will take no damage from you.