Simmering Flames: When Super energy is full, Melee and Grenade recharge twice as fast
Cauterize: Enemies fell by my fire regenerate my health
Fire Keeper: While standing in a sunspot, gain an overshield and Hammer of Sol lasts longer (And a Recovery stat increase)
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If your looking to save your super for later... simmering flames. If you wanna spam your super... cauterize. If you wanna capture a point and fend off anyone one else ( such as trials of osirus)... Fire keeper.