Crustoise

Crustoises are a unique monster found in decayed, desert, forest, jungle, magma, midnight, savannah, and volcanic biomes. They can also be found in the Desert Subsurface underground layer as well as in Stone Caves and underground layers 0a, 1d, 3b, 5a and 5d. They can also be found in Ancient Vaults with electric, fire, and poison themes. They can crawl on walls and ceilings, enabling them to move over any surface. Their primary attack is to dash at the player, revealing their underside and face. This monster has a weakness (+50% damage taken) to Poison damage and a resistance (-50% damage taken) to Fire damage. Additionally, it cannot be inflicted with Burning. “The sharp spikes can penetrate any space boot."