The Wilt Crab is a strange, almost circular red Crab with lots of plating. I'm not sure where exactly they can be found, but the one I found was at the ocean floor of an Atropus Sea Planet.
When Idle, it just moves back and forth, seemingly always getting stuck on tiny ledges. It has two attacks:
1: It shoots a small amount of Bubbles towards its target, which each have a base damage value of __ (Cold), but do not slow the target down aside from recoil.
2: It charges toward its target at high speed, barely even (If at all) impeded by liquid, dealing __ base damage (Physical).
It appears to always perform attack 1 first, then alternate between 1 and 2.