Tome of Fireball XII

Prior to Patch 2.0.1, this was the only way to learn Fireball Rank 12. Now it can be learned from a trainer at level 62.

Source
This item drops from:
 * Ossirian the Unscarred in Ruins of Ahn'Qiraj
 * Ayamiss the Hunter in Ruins of Ahn'Qiraj
 * Kurinnaxx in Ruins of Ahn'Qiraj
 * Moam in Ruins of Ahn'Qiraj
 * Buru the Gorger in Ruins of Ahn'Qiraj
 * General Rajaxx in Silithus