Summons an Air Totem with 5 health at the feet of the caster, empowering allies within 30 yards with lightning. While empowered, allies' spells and attacks will trigger bursts of electricity, dealing additional Nature damage to their target. Lasts 10 sec.
Ghostcrawler explained the exact mechanics yesterday:
-- The base damage is 20% of AP or 30% of SP, whichever is higher.
-- That amount is multiplied by 0.2 for normal pets, and by 0 for guardian pets.
-- Next, if it’s an autoattack (or spell that we count as an autoattack such as Wind Lash or Shadow Blades or Tiger Strikes), then it’s multiplied by 0.4, and then by WeaponSpeed / 2.6. And if it’s an offhand attack, it’s then multiplied by 0.5.
-- If it’s periodic damage, it doesn’t Stormlash, unless it’s Mind Flay, Malefic Grasp, or Drain Soul.
-- For all other spells, it’s then multiplied by BaseCastTime / 1.5 sec, with a floor on the BaseCastTime of 1.5 sec.
-- And then there are multipliers for certain spells: 2x for Lightning Bolt, 2x for Lava Burst, 2x for Drain Soul, 0.5x for Sinister Strike.
-- Finally, that’s the average damage it deals. It will actually deal that +/- 15 %.
-- It also has a 0.1 sec ICD on triggering, and can miss based on spell hit.
- 100% proc rate off of qualifying attacks.
- Mind Flay seems to work off of the time per tick, as opposed to the actual cast time of 3 seconds and therefore receives a modifier of 1.
- The initial hit of DP triggers it.
- The initial hit of SW:P does not.
- Mind Bender is a guardian pet and does not work with Stormlash.
Now just from the numbers I've seen, it doesn't seem like it is worth it at all to change the rotation to try to benefit from Stormlash, but I just wanted to get some more opinions in case I missed something.