The Bad Ailment
The Bad Ailment (aka Vanalondium) is a BAD BAD ailment. You don't even know how bad it is. It steals cookies from the cookie jar when nobody's looking. It is found usually in satanic blood and Grues, its so evil.
Vanalondium is a metal at room temperature. Its color is black. It emanates a red aura, because of how evil it is. It is used by devil-worshippers to make satanic circles.