I would like to make a couple of assertations:
- It is not hard to farm the first boss with a healer/dps combo, but I would imagine that not every class can solo it. If you're a dk, pally or druid, congratulations, kill the trash leading up to Attumen, then kill Attumen and collect lewtz.
- You will probably have to farm it for a while. This is obvious to anyone who has read the comments on any other rare drop, in particular any rare mount drop.
- This mount is the coolest ground mount in the game.
Let me defend #3 there for a second. There are other cool mounts in the game. Zulian Tiger, Amani War Bear, Spectral Tiger, Black Qiraji Battle Tank, Dark War Talbuk. There are a lot of other cool mounts, actually, and some of them probably look cooler than this one until you recognize something, something that is noticeable from every screenshot submitted to wowhead. And once you recognize it and keep in mind that virtually everything in Karazhan is of an undead nature, you will make a connection.
This mount has fangs.
You are riding a vampire horse that is on fire. Let me repeat that. You are riding a vampire horse that is on fire.
I don't even have to say anything else. "My mount is the Black Qiraji Battle Tank, a rare mount belonging only to the select few people who were selected as champions by the mortal races of Azeroth and the Bronze Dragonflight." "My mount is a vampire horse on fire." "You win."
And the rarity of it is arguably greater than many other mounts, for people who enjoy the "I have something you don't" factor. And one other small thing that helps secure this horsepire's
position as the greatest ground mount in wow? Tauren can go through any door in the game on it without having to dismount. It's a small thing, but not being defeated by your own tremendous girth when you want to go through a door while mounted is a nice little bonus to riding a vampire horse. That is on fire.