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Surround yourself in a vortex that continuously deals 105% weapon damage to all enemies within 10 yards. The vortex lasts 6 seconds and is refreshed each time you strike an enemy with a melee attack. Landing a Critical Hit has a chance to increase the vortex effect up to 3 stacks for a total of 315% weapon damage.
As long as your vortex is at 3 or more stacks, you gain 8 Spirit per second.