Will Nexon put DB skill books in CS?

Slash storm is a pre-requisite of bloody storm - the latter is a direct upgrade of the former. Hopefully we'll be able to get all the important ones for under $10 via CS. I don't plan on getting more than one point of tornado, and even that is just for mobbing.

We'll almost certainly have to get Slash Storm, Tornado Spin, Mirror Imaging, and Flying Assaulter from CS, unless they decide to add Hob King PQ with Dual Blade, or even bother letting those drop at all, and I somewhat doubt they will.
Sudden Raid and Thorns Effect are both 4th job skills, so those will probably have skillbooks dropping from bosses(Zakum, Papulatus, and Horntail primarily)/Leafre/ToT mobs like the other jobs.