With Echo's World First kill of Fyrakk happening just earlier today, the World First drop of the legendary axe Fyr'alath the Dreamrender has also happened! We've catalogued the questline with the help of Echo's recipient, Meeres!
The questline starts with the item Fyr'alath the Dreamrender, which has dropped for the first time on Echo's World First kill of Mythic Fyrakk. This axe is equippable, but attempting to equip it will envelop the user in Shadowflame, and eventually overpower them. Once this is done, you will receive a new quest, The Shadowflame Axe, which requires you to visit the Azerothian Archives to find an expert in Shadowflame.
This search leads to the location of the Azerothian Archives previously teased in the Patch 10.2.5 preview, which seems to be in the floating isles just north of Alge'thar Academy in Thaldraszsus. Arriving there, you will find Eadweard Dalyngrigge, a Lead Archivist and supposed Shadowflame expert.
Eadweard tells you in the quest Handling It that you will need to modify the weapon's haft with three components to be able to withstand the head:
The Leatherworking portion of the weapon can be found with Erden, a centaur locasted just east of Mountainview Post in the