Kael'thas rework idea

as we all know Kael’thas or KT is a hero which is really underpowered yet broken at the same time he’s unbalanced, to say the least.

level 1
fell infusion: healing increased from 94hp to 4% of max hp.
quest: hit heroes with an ability which is empowered by verdant spheres each hero hit will increase KT’s max hp by 10.
convection: quest hit at least 1 hero with flame strike if you hit a hero increase the damage of flame strike by 1 all stacks are lost on death and you can’t get more than 1 stack per flame strike (meaning you don’t get extra stacks for hitting more heroes).

level 7
sunfire enchant removed
twin spheres moved from 16

level 10
pyroblast removed
fire mind: deal 90 damage per second in a large AOE. increasing damage by 50 per second up to 6 seconds. kael’thas can’t move while he is channeling the ult.

level 16
twin spheres moved to level 7
new talent fire starter: basic attacks will cause a small explosion dealing 76 damage in an AOE around the target hit if they hit a hero (the explosion will not deal extra damage to the hero hit). passive increase attack range by 1.1

level 20
power of the sun: fire mind will deal 25% increased damage and can now be cast endlessly but the damage will no longer be amplified.