The summoned Harbinger is immortal, and occasionally casts Arcane Surge on the player. Arcane Surge is a buff that lasts 4 seconds, with a cooldown of 8 seconds, and grants the following benefits: 10% increased Cast Speed 30% increased Mana Regeneration Rate It also simultaneously grants a buff called "The Surging Thoughts" that grants the following benefits for 4 seconds, also with a cooldown of 8 seconds: 15% chance to Shock Damage Penetrates 10% Lightning Resistance All "Summon Harbinger" skills share a maximum of 1 Summoned Harbinger.