[quote=@Prince of Seraphs] Actually I've been meaning to ask, why is that? Don't get me wrong it's badass and everything but is it like a genetic trait, part of his semblance, a manifestation of his aura? [/quote] I have no idea. Time for baseless speculation! It's part of some tragic, traumatic backstory that may or may not ever be revealed. I can't make much comment on this, since Oswlad's tentacle Aura shenanigans are basically that, just more spiritual and with a bit of basis in canon (Yang's flames, for example)