Stormrage

As of U34 damage scales with spell power when a spell is used. So on spell use it's not uncommon to see high enough damage that the spell point cost is worth it. It may not be activating off all spells - needs further testing. Melee, and ranged attacks only do base damage. The lightning strike animation seems to activate more often than damage is dealt. Damage dealt has an internal cool-down of one second and only affecting one enemy when off cool-down.

Testing: