The Skull of Gul'dan (quest)

Objectives
Relive Illidan's battle for the Skull of Gul'dan.
 * Skull of Gul'dan obtained

Description
Illidan set out to find the Skull of Gul'dan. He fought through armies of demons to reach it, slaying them with the power that made him a hated outcast.

See him in battle,. Witness the one that fought the fiercest against the corruptors of Felwood, and struck at its source.

Completion
Now you are beginning to see...

Gains
Upon completion of this quest you will gain:
 * 6,290 XP

Speculation
The red crystal displayed as containing the Skull of Gul'dan in this quest may be the Mysterious Red Crystal that ended up in Darkshore.