Starting from the top (aka reverse order) with lots of burning manipulation in Wildfire...
Wildfire
4 Wildfire: sustain. Fire res pen and damage bonus. Allows your burning tiles and status effects to spread.
3 Dragon Whirl: active. The Fire super nuke. Does damage to an area based on the number of burning tiles in it and sets enemies on fire.
2 Cleansing Flames: passive. Nerf it from prodigy level to talent level by making it reduce duration instead of flat removal. Add the self fire damage resistance here.
1 Gather Flames: active. Consumes burning tiles around you to enhance your spellcasting for a few turns.
Fire
4 Burning Wake: sustain. All your Fire spells leave burning tiles.
3 Flameshock: active. Cone of fire that inflicts Burning Shock.
2 Flare Shield: active. Temporary bonus to defense, fire and cold resistance, and light radius. Burns melee attackers. Leaves a trail of fire with Burning Wake.
1 Fireball: active. Radius 1 fire damage bolt. Doesn't hit yourself.
Pros: Lots of utility. Useful for Arcane Blade. Funsies with burning effects.
Cons: Only 3 damage talents...

It really needs another offensive talent where Gather Flames is. Blastwave would be ideal. The question is what goes, Cleansing Flames or Gather Flames? Maybe merge them and have Gather Flames burn off debuffs on you? The self fire damage resistance can be moved back to Wildfire. Maybe drop the spreading flames effect from Wildfire, it wouldn't be easy to code. Dragon Whirl could burn buffs instead of setting enemies on fire?