These things can only be found in Subterranean Desert 2 & 3 in PSOBB Episode 4. You'll find it most annoying: This thing can change it's elements to Thunder, Fire & Ice.
If you stray too far it will try to pull you right to it! Whenever you hit it, you were able to prevent from being Shocked/Frozen. The claws are its protection so you may want to attack in the center. It's not a good idea to do this alone but in a party it is. Make sure you have a high-leveled partner with you to slay it for you. (Don't forget to hit and run so you can get EXP! And make sure you survive or you won't get any.)