A new polymorph, Tome of Polymorph: Mosswool has been discovered in The War Within in a fun little easter egg featuring Millhouse Manastorm, Valeera Sanguinar, Garona Halforcen, and more.
Arcane MageFire MageFrost Mage
Nestled in a sideroom dwelling of a short underground cave network in Dornogal, a few Rogue survivors of Dalaran have setup a makeshift tavern complete with a bar and Hearthstone board planning their next move. To find the room, simply head through the entrance tunnel (/way 58.7 6.5) till you reach The Kindling Parlor (/way 61.8 5.4).
Inside the parlor, you'll find a considerably underdressed Millhouse Manastorm across a Hearthstone table from Valeera Sanguinar while Garona Halforcen tends to a sleeping Captain. Taoshi inspects of map of Azeroth in the corner while Lord Jorach Ravenholdt sits at the bar tended to by Bartender Bob.
For Mages, Valeera Sanguinar has the Easy Win quest available in which she explains that's she's basically taken Millhouse for all he's worth in a few games of Hearthstone likely explaining his lack of clothing beyond his undergarments. She offers the spell Tome of Polymorph: Mosswool as gratitude for your efforts aiding the survivors of Dalaran.
Level 80 mages can click the tome allowing them to learn the new polymorph for Mosswool, the sheep-like animals inhabitating Khaz Algar. Below you can see an example of the new polymorph:
Scort polymorphed into a Mosswool
Special thanks to Scort and Truefire of Illidan for extra help testing and screenshots.