The Maruns resemble green pill bugs.
The Maruns only appear in Chaos Angel. In gameplay, the Maruns wait in one spot until the playable character get close, upon which they will curl into a ball and roll into them. While curled into a ball, the Maruns cannot be harmed by direct attacks, and any attempt to launch physical attacks on them will only cause the playable characters to take damage. As such, the player must either quickly destroy a Marun or dodge it as soon as they encounter one. However, indirect attacks like the Hammer Attack or Chao Attack can still defeat a Marun even after it is curled into a ball.