Spam Inferno til the entire screen is on fire to get a lot of extra power strength and then activate Gloom. Alternate between Fire Blast and Inferno to keep heat high without the passive drain, strip armor and get Energy Orbs from [Exothermic]. Fire Blast and Arcane Eruption will knock enemies down like crazy and Gloom makes it so they're slower to get up and also heals you. At the rate you're spamming Fire Blast; [Brief Respite] will provide a lot of shields to take advantage of shield gating (equip a Decaying Dragon Key too). [Rolling Guard] for status cleansing and safety. In normal missions, [Vitality] is probably better.