Fulmination

Lightning Bolt, Lava Burst, Chain Lighting, and their Overload spells have a a variable amount chance to generate a stack of Fulmination, up to a variable number stacks. · · Earth Shock

will discharge all stacks of Fulmination on the target, causing an extra variable Nature damage per stack of Fulmination. · · Earthquake's cast time is reduced by a variable amount per stack of Fulmination, and Earthquake deals a variable amount more damage for each stack of Fulmination.