Current Elemental Shamans with BiS gear at 40 have around 200-210 Spell power…I calculated this off gear from warcraftlogs . Add the +300 spell power obtained from the new Rune from double RB…now we are looking at Current level 40 Shamans with the Rune sitting around 510 spell power…now lets get into the spell power calculations.
Chain Lightning - 2.5/3.5 - 71.42%
Lightning Bolt - 3/3.5 - 85.71%
These coefficients represent the % damage added to the spell based off Spell power.
So lightning bolt at 400 damage + 20 extra damage from the talent 5% (this could potentially be calculated after the coefficient is applied) will hit for:
420+(510 x .8571) = 857 Non-Crit
Now lets check the Crit on it. 857x2 = 1714 damage crit on a single Lightning Bolt cast while the minute buff is up (this isn’t even including your Overload proc)
So total damage with Overload is now 1714+(1714x.5) = 2571 damage on 1 single cast of Lightning Bolt.
Now lets do Chain Lightning.
459 (with 5% buff) base damage.
459+(510 x .7142) = 823 Non Crit
823 x 2 = 1646 crit and then at 50% from Overload 1646+(1646x.5) = 2469
Your FIRST target on the chain lightning will take 2469, 2nd target takes 1728, 3rd target 1209, 4th will take 846
So for one SINGLE Chain Lightning you will do a total of 6252 …
Lava Burst now.
742+(510 x .8571) = 1179 Non Crit
1179 x 2 = 2358 crit and then at 50% from Overload 2358+(2358x.5) = 3537
Now also lets take into account this is with CURRENT GEAR and CURRENT Level…so these numbers will ALL go WAY up.
EDIT: Also if you see an issue with the math, let me know. I’ve already revised these calculations a few times so anything to help if you catch something would be appreciated.