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Invincible was a horse and an important friend of Arthas. After an injury and without any chances of calling for help, Arthas had to put the horse out of his misery. Years later, now a Death Knight, the horse was risen to serve his master on his dark path.

The mount nowadays only drops from killing the Lich King on Icecrown Citadel 25 man Heroic, and has a really small chance of dropping. With the introduction of the Black Market Auction House, it now have a chance of being sold there. It's one of the most envied mounts ingame.

Even though this mount has a very low drop chance, its just a matter of time until you get it.

I got many rare raid mounts, and they have been like this. Only miss this one. So if you want it, go get it.