We have just found the arcane hidden artifact appearance on a 500 member Discord group (
Order of the Shepherd) on which I am a moderator.
We've been working for 1 month, but we've come to this conclusion:
1.) Polymorph specific mobs in 5 different Broken Isles zones:
2.) Reach Artifact Knowledge 6
3.) There is a daily roll for a volatile sheep to spawn within the Hall of the Guardian and when it does, right click it a few times and it will explode
4.) Find an Enraged Volatile Sheep roaming around in Runewood in Stormheim, right click it a few times and it will explode.
5.) Head to Tower of Azora in
Элвиннский лес and complete a short event
6.) You get your staff!
All of the mage community were working together and found the appearance on this day, a few minutes ago. Irador and Nico were especially helpful in this research.