The Mark of a Hero (マークオブヒーロー, Māku obu Hīrō?, lit. "Mark of Hero") is a Keyblade that can be wielded by Terra, Ventus, and Aqua in Kingdom Hearts Birth by Sleep and Kingdom Hearts Birth by Sleep Final Mix.
The teeth of this Keyblade is the arm of a trophy and the hilt is a pillar which is a sign of Olympus Coliseum. The Keychain token is once again the Olympus Stone, used to signify the world's heroes.
The Mark of a Hero's name may reference "the ability to become a true hero", a common theme in the Olympus Coliseum storylines.