So current rank of lightning breath is 36-40 and we will get 1 new rank next phase which will be 51-59.
Add in the 30% damage from the rune and 20% damage from the pet talent then add in 50% damage from Bestial wrath.
The rune also gives the pet 80% more focus regen and the talent next phase gives a other 20% focus regen.
Then add in blizzards SOD pet scaling with higher focus abilities doing more damage and Lightning Breath is the highest focus cost spell a pet can have at 50 focus.
I’m not sure how the math all maths out but what a time to be alive.
And that’s how it would go except hunters can’t learn the next rank next phase. So I’m assuming wind serpent is pretty dead.