Originally Posted by
Slashley
I assume you're not maining any element?
With the soon upcoming nerf to Awakening costs (Nutaku please don't delay this), there's really no reason to hoard books. So here's my recommendations, not really in order:
Ithaqua. Having a back-up healer opens some doors for you. Maybe you'll need to use Vivian for Cleanse because Behemoth just isn't enough. Probably not (as you're much better off using Mordred with Cleanse than Vivian with BP), but should it happen, having Ithaqua ready is really good for you.
Enkidu. Just like Nemesis, she's really good to pop into your team when somebody dies during Rage phase. As such, maxing her is recommendable if your sub-slots aren't filled by SSRs.
Hermes and Hermod both gain a second turn to their Intercept, which is really powerful. Particularly when your team is in pieces and only a couple of Hime are left.
All the rest are fairly bad, unless I missed someone. Giving them the books will increase their base stats, but that's just about it.