Venus the shattered Coast. The incediary grenade,golden gun combustion perk works wonders for me. There is an area in the shattered coast that's a pretty popular farming spot in that room which houses some fallen vandels,dregs,and 1 servitor.
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This room is great for the bounty to get 30 solar ability kills. Set a tripmine in the back of the room, jump up the side of the building to make them spawn and boom. Instant 5 kills and the servitor at 10% hp. With Frostees or double tripmine arms and high discipline, there really should be no downtime before you have another grenade