Molten Comet

Harnessing the raw power of the storm, the Shaman transcends lightning itself. Upon reaching 5 stacks of Elemental Mastery, Lightning Strike is replaced with Molten Comet - a high-impact single-target spell that unleashes a blazing meteor from the Shaman’s own hands dealing
Value unavailable = [[60 / 100 / 140 / 180 / 220] + ([80% / 90% / 100% / 110% / 120%])Spell Power] magical damage.
On hit, applies a Ashen Decay DoT effect to the target which deals Value unavailable magic damage each second over 7 seconds (total: [50 + (200%)Spell Power]).