Wear praxis fire chest if you have and spam firebolt grenade with burn perk, reduced damage perk for radiance, and when verticality isn't a factor bunny hop with the jump that gives you a boost it is actually quite fast
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I sunbro myself but I know it's very underpowered compared to hunters. A good indicator is look at your medals: how many scorched earth medals do you have compared to way of the gun and gutted?