Flametalon of Alysrazor

Flametalon of Alysrazor (aka Flaming Anzu ) summons Flametalon, an ground mount that requires 150 Riding skill to ride. It has the appearance of a fiery Raven Lord.

Source
This item has a very low chance to drop from Alysrazor in both 10 and 25 player modes.

It also has a chance to be listed on the Black Market Auction House by Mei Francis, for the opening bid of.

Mount Journal
As with their matriarch, Alysrazor, the fury and fervor of these elemental avians are unquenchable.