User blog comment:Sentry 616/Weapon Gushing/@comment-26512661-20190714223843/@comment-27144409-20190714224435

This isn't what the blog is about. Also Cinder.

Obsidian is an interesting substance. Naturally smooth, when it gets and edge, say from shattering it, it develops an edge that's just a few molecules wide, and keeps it a long time, so it's crazy sharp.