Tome of Polymorph: Black Cat

Tome of Polymorph: Black Cat teaches a mage the ability: Polymorph: Black Cat. Learning the spell consumes the tome. This spell is mechanically the same as Polymorph (Rank 4), except the target is transformed into a black cat instead of a sheep.

Source
This is bought from Endora Moorehead in Dalaran for at neutral reputation with the Kirin Tor. The price on this is subject to discounts as your reputation with the Kirin Tor increases. At exalted, the cost is.

This is a limited-availability item.