1,000 Tomes of Ok'Tal ?

[Duped]

I hit level 50 (yay!) and got the tomes of Ok'Tal quest. What is the best and fastest way to achieve this?

Ie - which boss and level etc.

Someone told me the Keeper in Victory Lap gives 2 per time he's defeated, but he only gave one when I did it... Thanks!

Edit: Yes, Totem's my bad.