WoWDB

This item unlocks the hidden appearance of the same name for the Arcane mage artifact,  Aluneth.

There are different mobs in the Broken Isle zones you need to do a one time polymorph on:

• Zone Targets Polymorphed: Azsuna - Cliffwing Hippogryph
• Zone Targets Polymorphed: Highmountain - Highpeak Goat
• Zone Targets Polymorphed: Stormheim - Plains Runehorn Calf
• Zone Targets Polymorphed: Suramar - Heartwood Doe
• Zone Targets Polymorphed: Val'sharah - Wild Dreamrunner

You must also reach Artifact Knowledge level 6.  After that:

• Every day you have a chance to unlock the next part of the chain via the Sheep Summon Daily Roll by entering your Order Hall
• When the roll is successful, a Volatile Sheep will appear next to you in the Order Hall. Click it until it explodes.
• Head to Runewood in Stormheim and find the Extremely Volatile Stormheim Sheep. Click it until it explodes.
• Head to the Tower of Azora in Elwynn Forest and meet Cote "Shepherd" Metcalf.
• Help him defeat the Enraged Elwynn Sheep, witness another part of the event, and then kill him.
• Loot the The Woolomancer's Charge!

Occasionally when polymorphing things, the staff will change from the regular model to the model below and scream.

Thanks go to Order of the Shepherd discord for puzzling out the process.