Sarcophaghoul

Sarcophaghoul, known in Japan as mystery coffin, is an enemy found in the Capsicum Caverns on Razen in Magical Starsign.

Profile
Sarcophaghouls are possessed coffins with red eyes and ghostly extended limbs. Their attached covers appear as mouths.

Enemy
Sarcophaghouls possess earth affinity, gaining aura when Erd is in alignment. They are capable of gravel pounder, dealing damage to up to three members of the party. They also have the physical skill summon bats, which significantly damages all party members. They have increased resistance to magic attacks.

Bestiary entry
It's said that this coffin holds the mysteries of the universe. Or a dead guy. No one's really sure. Or it might be full of money. Only one way to find out!

Trivia

 * Sarcophaghoul also appears in Magical Vacation, referred to as mystery coffin in the English fan translation.