Invocations of the Scourge.
Invocations of the Scourge is a book found in the Chamber of the Guardian of Dalaran during the quest 
[45] Dabbling in the Demonic.
Content
Invocations of the Scourge
<Levia has marked a page in this book detailing powerful death runes. One of these runes is drawn in the ritual circle>
These are various runes used by the scourge to empower their death magic rituals. Of these, one of the most powerful is Taam - the mark of the Lich.
It is used in the creation of Aberrations and Bone Golems, but can be employed in many rituals requiring powerful death magic.
Patch changes
Patch 7.2.0 (2017-03-28): Added.
