Ultimate Death Knight Spellbook

Can anyone please guide me on how to obtain the Ultimate Death Knight spellbook?

 

I wonder how much it is worth.

 

Hey,

drop from:

1. Antharas - 17.87% - 21.87%
2. Avatar of Antharas the - Beast (?) (translated from RU wiki, not sure if this is correct name - Antharas Lair instance - not opened right now) - 1.753% - 2.153%
3. Baium - 0.5% - 1%

A lot, XX/XXX L8000.

 

Damn. Thanks for the info. Looks like there is a 0.0000000000001% I will get this spellbook.

 

Probably after some time it will be normally available.