I've had the Polaris Lance and its catalyst for years. I think it would be great for VOG, but I still am not getting any progression on the Perfect 5th kills. Catalyst has been stuck at 5 kill count for years now.
EDIT: Any location will work, as long as the burn final blow is on a Cabal. The explosive round final does not count, it has to be the burn. So shoot a bunch of Cabal and let that final burn out work. A bottom tree solar titan helps. Thanks for the suggestions of things to try!
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Have you watched any recent guides? I had to farm the kills in the castellum back in the day. Wasnt that hard....