User blog comment:VedranTheII/Pretentious Diaries 2: What tricks would you teach your Aura?/@comment-26512661-20150718155058/@comment-25396609-20150718205409

They used it for small blades, but obsidian has poor compressive strength, it's fragile. anything larger than a dagger would break under its own weight. (I'm looking at you, elucidator)