Level 3
Exploding Soul.
(1/round) On your turn, you may suffer a Wound. Whenever you gain a Wound, deal STR+Wounds damage to any creatures you choose within 2 spaces (ignoring armor) and give them the Smoldering condition.
Level 7
Blazing Speed.
Gain +2 speed while using Windstep. After you cease movement with Windstep, enemies you passed through take STR+DEX fire damage. You may have Smoldering enemies take double, ending the condition.
Level 11
Chain Reaction.
(1/turn) When you crit, deal fire damage equal to your STR+Wounds to creatures of your choice within 2 spaces of your target. Repeat any number of times, targeting creatures not yet damaged by this effect within 2 spaces of any already damaged.
Level 15
Burning Soul.
Double any fire damage you deal.
NNimble Co.
Heroes