Arcane Surge is a buff that grants bonus cast speed and mana regeneration.
Arcane Surge lasts 4 seconds by default. Unless otherwise stated, Arcane Surge granted from equipment, passive skills, and Ascendancy passive skills assume a level 1 support gem:
If multiple sources of Arcane Surge are active at once (e.g. from Arcane Capacitor and a lvl 20 Arcane Surge Support), only the one with the highest effect grants any bonuses.