The Demon Weapon

The Demon Weapon is a quest that serves as a prologue to in. Abnur Tharn has acquired two halves of the Wrathstone, a ancient tablet shows map depicting the location of a weapon that could potentially end the Three Banners War. He enlist the help of the Vestige to help him locate the weapon so he can end the war.

Background
Direct start journal entry:

Imperial battlemage and former Grand Chancellor of the Empire, Abnur Tharn, requested my assistance with an important matter that could lead to the end of the Three Banners War.

Quick walkthrough
Tell Tharn to Stop Looking
 * 1) (If quest was started with Sealed Imperial Summons)Talk to Abnur Tharn
 * 2) Talk to Abnur Tharn
 * 3) Gather Mushrooms in Brewen/Enduum/Hightide Hollow
 * 4) Talk to Dagaril-dro
 * 5) Talk to Abnur Tharn
 * 6) Find the Moon-Singer at Redfur Trading Post
 * 7) Talk to Abnur Tharn
 * 8) *Optional: Talk to Azargo Long-Tale
 * 9) Locate the Secret in Wormroot Depths
 * 10) Solve the Khajiiti Puzzle
 * 11) Take the Triangulant Tile
 * 12) Find the Moon-Singer at Baandari Trading Post
 * 13) Talk to Abnur Tharn
 * 14) *Optional: Talk to Mizbina
 * 15) Locate the Secret in Black Vine Depths
 * 16) Solve the Khajiiti Puzzle
 * 17) Take the Triangulant Tile
 * 18) Find the Moon-Singer in Rawl'kha
 * 19) Talk to Abnur Tharn
 * 20) *Optional: Talk to Satarri
 * 21) Find the Secret in Jode's Light
 * 22) Talk to Khamira
 * 23) Enter Jode's Light
 * 24) Talk to Abnur Tharn
 * 25) Tell Tharn to Keep Looking
 * 1) Locate the Secret in Jode's Light
 * 2) Solve the Khajiiti Puzzle
 * 3) Take the Triangulant Tile
 * 4) Talk to Abnur Tharn
 * 5) Listen to Khamira
 * 6) Talk to Abnur Tharn

Reward

 * 73-302