Ok theres currently 3 books available, will be 4 eventually. From what I understand, book 1 is the weakest due to the 250% and should not be maxed. That leaves book 2 and 3 at 300% dmg. Does this mean I should max out book 2 of the fire nuke as well as book 3? Or should I only max out one of them and wait for book 4 to max?