The_Lex
It's a Haj Mota. The one you fought is part of the group of enemies before you reach the first mini boss. The second official boss of the dungeon is a Haj Mota that is about 20x larger. The Xit-Xaht inhabitants take to calling him, Mighty Chudan.
Paws
I killed all of two enemies before this Haj Mota ate me alive. I turned tail and fled asap It's a beauty, though, and incredible looking creature! Thanks for naming him, I didn't even have time to register the on his health bar.