A Glowing Key

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

Acquisition

Find the cabin located in the area known as Apostate's Landing, near the northern most two objective points of the quest Wardens of the Coast. The area is centrally located between three points, northeast of Small Grove Camp, southeast of the Morrin's Steps marker and northwest of The Stone Tree marker. Once inside the cabin, interact with the locked door; note the door can not be unlocked at this time.

From this point, the holder of the key known as "Rebel Mage" can spawn in various locations around the Storm Coast, including right in Apostate's Landing. He can be encountered randomly and tends to be wandering around. The mage will attack on sight; be aware that this is a boss creature and possesses strong fire resistance and fire spells. Kill the mage and loot the Glowing Key to begin the logged quest A Glowing Key.

Note: Rebel Mage will not spawn until the cabin is discovered and the locked door within has been attempted to be opened. However simply interacting with the locked door prior to obtaining the key will NOT give this quest--it is obtained only after the actual key has been looted.

Walkthrough

Mighty offense potion recipe location — Cabin location

The cabin's location will be marked on the quest map after looting the Glowing Key. Return to the cabin and open the locked door to complete the quest.

The codex on the table just inside the previously locked door grants XP. In the basement there are two chests; one contains the Mighty Offense Tonic Recipe, the other contains random loot.

Rewards

44 XP
40 Influence
Mighty Offense Tonic Recipe (looted from chest)

Codex entries

Codex entry: Notes Found in a Mage's Hut

Companion quotes

Upon entering the basement located beneath the locked room, all companions with the exception of Dorian will remark on the ghastly scene.

A glowing key shrine — The shrine in the basement

Cassandra: "This place makes my skin crawl."

Solas: "This place is unpleasant."

Vivienne: "This place is horrid..."

Sera: "Haha... Creepy, yeah?"

Iron Bull: "This place is creepy."

Cole: "I don't like it here."

Blackwall: "I wouldn't linger here."

Varric: "This place is creepy."

Dorian: "Right, adventure. All part of the experience."