Effect
Arcane Charge
Arcane Charge adds 2 spell damage against a Threatened target.
The target must be Threatened. For example, an allied warrior can threaten an enemy while the caster with Arcane Charge attacks that enemy from a distance. The in-game tooltip misleadingly suggests that the bearer must be Threatened.
Arcane Acuity improves spell rolls and save DC, while Arcane Synergy adds weapon damage. Distinguish these similarly named effects when choosing equipment.