Khyber Dragonshards

These shards grow on the walls of volcanic caverns deep underground, usually near pools of magma or sulfur vents. They are smoky crystals with colored veins of midnight blue to oily black. Their affinity is for magic related to the binding of elementals or even living souls. Thus, crafting a bound-elemental item requires binding the elemental to a Khyber shard, and these shards are common components of binding diagrams, rituals that trap souls and other spirits, and similar magic. Khyber shards are sometimes called nightshards or demonstones.