Lava Crab

Behavior

They disguise themselves as stones, sometimes surprising the player. When immobile, they are invulnerable to attack, though they can be hit with a pickaxe to knock them back, making them mobile again.

Strategy

Lava Crabs may be differentiated from rocks by striking them with a weapon. A Lava Crab will make a knocking sound and a zero damage indicator will pop up when hit with a weapon, while a rock will not.

The Lava Crab can only be dealt damage if it is mobile, and not hiding beneath its shell. Strike an immobile Lava Crab with a pickaxe to make it mobile again.

Striking a Lava Crab with a pickaxe enough times will knock the shell off of its back, and will cause it to flee. Alternatively, setting off a bomb near a Lava Crab can remove its shell, and will cause it to flee as well.