Crawlers

"Have you seen those gemstone creatures in the caverns? Their colors are simply breathtaking!"

Crawlers are Pre-Hardmode enemies found in the Underground or Cavern layers. They currently come in eight varieties, one for every gem type, and one in The Hallow, themed after Crystal Shards. Crawlers spawn hiding in their gem shells. When damaged, they begin to run away from the player.

Trivia

 * Their damage and defense are sorted from "cheapest" gem to "most expensive" gem.
 * In previous versions of the mod, the Crawlers would attack the player regularly instead of hiding, and then fleeing as soon as the player provokes it.