The Cipher of Damnation

The Cipher of Damnation is the spell used by Gul'dan to raise the fel volcano known as The Hand of Gul'dan, in the process waking and driving insane Cyrukh the Firelord.

Source
This item is provided, and is an objective of, the quest.

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The Cipher of Damnation is indeed a powerful incantation. Ancient and chaotic, the cipher itself has been responsible for many tragedies in the history of our worlds. That is to say, it is not unique to Draenor.

The burning symbol you saw was the mark of Kael'Thas. His knowledge of the ancient words explains much.

Your discovery has roused the naaru. A'dal has requested your presence in Shattrath City. Should you choose to come, seek me out at the Terrace of Light.

Humbly Yours,

Khadgar }}