Doomium

This mod adds a new tool and armor set to minecraft, Doomium. This is an extremely rare ore found very deep into the ground. You can craft the tools with Doomium Ingots (Smelted in a furnace from Doomium Ore) and End Rods. (The End Rods are necessary to add extra difficulty in obtaining these tools.)

In my experience, it is very hard to find this ore.