Removes "Metallic" category from Obsidian. Oh, you can also craft stone knives.
I was a little bit surprised by the fact that Ludeon made Obsidian both Metallic and Stony.
I feel like this is an oversight, and they did not intend for obsidian plate armor, dining chairs, swords, etc (exclusively metal or wood items) to be made. They did make it sharp, even better than plasteel, but there is no sharp weapons that are made out of stone, so they just made it metallic.
