There will be skill crafting, so that you could put two skill books together and get a new skill. One of the shown will be Rain + Blood letting = Blood rain (Not so special because you can buy it anyway) an other was I believe: Summon Spider + Fortify for some kind of Terminator-Spider if I remember correctly.
Not sure how many craftable skills are planned, and if all will also be buyable anyway, which would make it less awesome for sure.
