Tyranmime uses a disguise to mimic a Tyrantrum and scare others with mighty roars. Once the victim is properly terrified, it pops out of its disguise and laughs at their frightened state.
A Tyranmime is a master of pantomime. Thanks to its gargantuan jaws, which could shred thick metal plates as if they were paper, it was invincible in the ancient world it once inhabited.