Celestial fire melee doesn't activate the exotic perk for Sunbracers consistently, or just not at all when you have the buff from your grenade for gliding. I think the name is heat rises, but it doesn't work when you have it activated.
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getting kills with celestial fire also doesn't count for melee kill bounty progress like it should. also doesn't work for impact induction. seems like there's a problem with it registering as a melee ability kill.