Obsidian

Masses of mineral and rock with the combination of lava has created what is now known as Obsidian - literally. The structure of the massive stone castle is tinted with purple, given the amount of demon blood that has been shed against it over the ages. What is not made from obsidian is forged by steel and bone, so all in all, it is an eerie and unwelcoming place to be. Obsidian is also excessively large, given it must accomodate daelorens.