Basically the books in general are a customization option for Nagash, while researching all of them (and the end tech) is a major buff for his Morgasts.

From personal experience, I tend to only use the Eighth and Ninth books but mileage varies based on how you want to build Bone Daddy's army.

Originally posted by TaelonZ:

Basically the books in general are a customization option for Nagash, while researching all of them (and the end tech) is a major buff for his Morgasts.

Mainly true but getting all nine books also:
1- provides cumulative buffs to Power Reserve and or miscast (i believe)
2- Unlocks an extra node that grants Nagash a few passives for an extra 1 point investment.

Considering you'd need to spend 10 points (9 books + passive skill) for those passives is not worth the cost IMHO unless you wanted to doomstack Morgasts.

Originally posted by Fragile Frank:

Considering you'd need to spend 10 points (9 books + passive skill) for those passives is not worth the cost IMHO unless you wanted to doomstack Morgasts.

I agree. It's one of the few things about this excellent mod that I think could use some tuning...especially since some books are worth so much more than others that unless you get all 10, there's little point...25% of your skill points on your Lord for not much utility.

Unless you could change books without a 1-turn wait, if that's a thing that could be changed.