User blog comment:SoulRise99/Sage Dragon Slayer Magic?!/@comment-1776824-20170222003110/@comment-1776824-20170222022510

All we know is that it steals souls, but we've never seen him use it outside of a roar. He has yet to truly use it in any noticeable capacity thus far. He has brute forced his way through things, and that's all we can really go off of right now.