The Cult of the Sky

The Cult of the Sky is a quest in the Mark of the Assassin DLC for Dragon Age II.

Acquisition
The quest is obtained from a Scholar at the southernmost point of the Hunting Grounds - West, after going past a clearing with 3 Ghast Nests.

Walkthrough
Speak to the Scholar to obtain the quest.

The Scholar tells you of his research into the Cult of the Sky, and that he had been searching for one of their altars in the area. He asks you to take up the search and hands you his notes. Note: If the Altar has already been found and the Spirits guarding it defeated, Hawke will have the option to inform the Scholar as such. This does not affect the progression of the quest.

After speaking to the scholar, a plot point appears on the Map leading you to a small clearing directly west of the entrance to the Hunting Grounds - West. When you reach the Altar, interacting with it causes the entrance to seal up, a Sky Horror to appear and fight Hawke and party.

The Sky Horror seems to be an Emissary-type opponent. He will cast spells on you and occasionally dart outside the barrier and summon Sky Cultists to attack you. Once you have defeated him, interact with the Altar again and the Cult's treasure appears for the looting. Note: If Hawke had killed the Sky Horror before finding the Scholar, he will still have to return to the Altar and interact with it again before the treasure appears. The treasure will not appear without the quest having started.

Result
Hawke completes The Cult of the Sky quest.

Rewards

 * Girdle of the Skies
 * Sacrificial Dagger