[Warframe Champion] Ember

I'm turning Warframes into potential champion concepts, based off of their actual abilities and passives in the game (tuned of course), and this is my fourth one, Ember. (I'm skipping Chroma due to how overloaded he is. If anyone wants to see him, I will put him in).

Empowered Flames (Passive): Being damaged by an enemy champion causes the next spell within 3.5 seconds to deal 35% Increased Damage and restores 10 mana upon being hit. This has a 4 second cooldown.

Fireball (Q): Launches a fireball at the target location, dealing 35/70/105/140/175 (+25% AP) magic damage at target area. Leaves the area scorched, dealing 50/100/150/200/250 (+80% AP) damage over 5 seconds. (40/45/50/55/60 Mana) (18/16/14/12/10 Second Cooldown) (400 Cast Range || 275 AoE)

Accelerant (W): Stuns enemies near Ember for 0.75/1/1.25/1.5/1.75 seconds. Enemies affected will be debuffed with Flammable for 6 seconds, increasing all damage from Ember's abilities by 30%. (30 Mana) (10 Second Cooldown) (475 Range)

Fireblast (E): Slams the ground, spreading a ring of fire outwards to 425 range. Enemies inside the ring of fire take 25/40/55/70/85 (+20% AP) magic damage per second. Ring lasts for 5 seconds, dealing a total of 125/200/275/350/425 (+100% AP) (50/60/70/80/90 Mana) (22/20/18/16/14 Second Cooldown)

World on Fire (R): Creates a circle of fire around Ember for 10 seconds. Targets a random enemy champion inside of the fire, dealing 175/225/275 (+50% AP) over 3 seconds. Randomly targets an enemy every 1.25 seconds, up to 8 hits on enemy champions, stacks twice. Enemies cannot be hit more than twice. At max stacks, deals 350/450/550 (+100% AP) damage over 3 seconds. (100/125/150 Mana) (150/120/90 Second Cooldown) (750 Range)