Necro Book Encyclopedia Necrotheurgia
 

Encyclopedia Necrotheurgia https://wiki.project1999.com/Encyclopedia_Necrotheurgia

is listed in grey under "pre-revamp" -
https://wiki.project1999.com/Innoruuk_(God)

but not in the https://wiki.project1999.com/Innoruu..._-_Hate_Revamp)

Does that mean this item is no longer dropped?

Drops off ashenbone broodmother.

The PoHate revamp info is somewhat underexplored on wiki.

It drops from Ashenbone Broodmaster, as stated. It's ludicrously rare.

This item still drops.

Back when I played regular, it dropped frequently and would rot more times than it was looted.

before the revamp

Move to caster sub section?

Yeah, this def belongs in Priest section.