He can't talk because if he whispers his voice is loud enough to destroy a building so he just uses aversion of sign language that he made up. That mostly only his family knows he is an inhuman and he is the king of Atalan and his wife. Medusa is the queen and his brother Maximus wanted to be king but has no power's and they have a big teleporting dog named a lockjaw and Medusa's younger sister Crystal uses a made a version that he and Medusa made up.