A Glowing Key

A Glowing Key is a side quest in Dragon Age: Inquisition

"A mage was carrying a strange, glowing key. Maybe it opens the door to the cabin in Apostate's Landing."

Acquisition
A Boss rank Rebel Mage is encountered randomly in the general area south to southeast of the Hessarian Camp. Kill him and loot the Glowing Key to begin the quest. He may not spawn until the cabin is discovered and entered.

Walkthrough
The cabin's location will be marked on the quest map. The entrance to the cabin itself is actually unlocked. The key unlocks a door inside the cabin. Open that door to complete the quest.

In the basement are two loot chests. The wooden one contains the Mighty Offense Tonic Recipe.

Rewards

 * 44 XP
 * 40 Influence
 * Mighty Offense Tonic Recipe