Boss End Game Passive Books - Plz Help

Hi Everyone,

I have been running T15 maps for days and still haven't found my first Boss passive skill book. Any idea what I could be doing wrong? I have done white, blue, and yellow maps, and still nothing.

You get them by killing pinnacle bosses for the first time:

Infinite Hunger, Black Star, Eater and exarch, uber elder and maven.

you also get books from first maven invitations both normal and bosses, like feared, formed etc..

Just talk to Kirac after and he should give you the books as a reward.

Thank you. I figured it out.