save yourself some sp, and delevel book 1 fire nuke to level 1, since you only need level 1 to get book 2/3
btw, light nuke are good when you can 1 hit stuff, and especially at penons, where mobs are sometimes quite crowded, you'd prob kill 2 at a time
imo, blade force wont do as much damage as opening with a nuke instead
unless, open nuke, then 3rd book devil cut is quite good, as devil cut delay isnt long, but means more sp farming