Spell Books - cleannrooster/Spellblade-Next GitHub Wiki
(1.19.2) Battlemage Spell Books give you overdrive of the corresponding type, which triggers when you hit with a spell casting weapon, giving you stacking multiplicative attack speed. They have two short range spells on top of this.
Elemental Source books have various spells for many situations, whether it be single target, area of effect, or versatility.
War tomes complement a melee playstyle for people who would rather not cast a bunch of spells all the time. They come with a defensive passive effect and a melee technique.
(1.20.1) Technique books complement a more melee playstyle with melee-range spells and skills. The Deathchill, Phoenix, and Echoes books provide unique and fun playstyles that are more complicated and may require more finesse to properly use.