Particularly, if you played the game, you would know he's a scorpion that digs in the ground to get around. However, you would also know his body is exposed about every second/every other second. This could be applied to either a scorpion or serpent based monster (or something I can't think of). It would have a stamina bar much like behemoth's. Also, he/she wouldn't be able to dig under rocks/metal objects. Any thoughts?
Here's a link for reference of scorponok's movement for those who don't know: