S03 - Item - Scarlet Enclave - Shaman - Elemental 4P Bonus

Chance to trigger Overload increased by an additional 10% and Lava Bursts damage is increased by a percentage equal to your spell critical strike chance. When Lightning Bolt or Chain Lightning deal damage, increase the damage dealt by your next Lava Burst cast within 15 sec by 10%, stacking up to 5 times.