In the most recent update, its demonstrated that if you combine a Hydrophist skill book and a Necromancy skill book, you get Blood Rain which is already a Necromancy skill (
https://www.youtube.com/watch?v=DiadjOstYL8 skip to 1:58). It is also mentioned that combining a Source skill book creates a different skill book. Basically, Im asking if there's gonna be a new set of skills for book combinations or if its pre-existing ones that now require it?