Red Rock is a clam like creature with a head in the middle of his 'shell'. A large pearl sits on top of his body and is surrounded by frills, and his whole shell is coloured bright red. Red Rock's arms are tipped by two sharp claws, and he has a long tail which drags along the ground.
Red Rock was the thirtieth monster to battle Greenman. It was created by Tonchiki in an attempt to retrieve the blood of children for Maoh. Red Rock and its creator teleported near some children who called for Greenman with their Green Calls. Greenman then did battle with the monster. Tonchiki saw that Giringa was losing, and cast a spell to make it grow larger. Greenman also grew to continue battling. Eventually, Greenman defeated Red Rock.