Undead essence(Des)

Undead essence, elemental material. Cursed.

This item is used to imbue an item or place with properties associated with the element it comes from.

Undead essence is mystically toxic and infects whoever comes into contact with it. Handle with care. (Or not at all!)

Kingdom element: blighted moor.

Reference
Appeared in Chapter 65 "Elementary, My Dear Newman"