One last thing: Ulber actually cast magic whether this is an inherent magical ability of their species or they are actually casting in a similar way a spellcaster would is left to the knowledge seekers speculations and everyone of you is welcome to RP their own theories.
It's obvious, Eonwind. Ulbernauts, with their large, clumsy claws and oversized jaws, are unable to filter bones and rocks from their food. And given the muscularity of their bodies, one can assume they are genetically predisposed to develop super strength in all kinds of muscle, including those which control the bowel and rectum. When ulbernauts face a stronger opponent, they defecate in fear, and their muscles spasm, causing the fecal matter (loaded with undigested bone and rock) to spray. This usually occurs just as the ulbernauts have turned tail, explaining the precision of these sprays and the common misunderstanding that it is a spell of defense. And finally, those who claim ulbernauts throw rocks are simply denying an unfortunate, biological truth.
