[2851] Allow Ossirian to use the Sand Vortex
[2852] Allow Hakkar to use Blood Siphon
[2853] Some improvements to the Archaedas encounter in Uldaman.

* Spawn the Ancient Treasure chest when the boss dies.
* Correct the aura spell to be removed when he awakes.
* Add emote when he awakes.

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[2854] Additional improvements to Uldaman