what is arcane synergy bg3

Arcane Synergy is a status effect or condition in Baldurs Gate 3 that provides a bonus to weapon attacks. Specifically, weapon attacks deal additional damage equal to the affected entitys spellcasting ability modifier). There are two items in the game that grant Arcane Synergy: the Ring of Arcane Synergy and the Diadem of Arcane Synergy). The Ring of Arcane Synergy grants Arcane Synergy for two turns when the wearer deals damage with a cantrip. The Diadem of Arcane Synergy grants Arcane Synergy when the wearer inflicts a condition. There is also a mod available that upgrades these two items by adding an AC and saving throw buff.