Rage is the quirk power used by the Hero in training Frage. As one can guess Frage took his name from the name of his power.
The Rage power gives the user enhanced strengthen and regenerative abilities. It also numbs the nerves allowing the user to fight through pain.
It sends the user into a blind berserk rage. It makes it hard to determine friend from foe or how much force needs to be used and what is over doing it.