[quote]After a bit of grinding and trying to figure out what the Polaris Lance catalyst actually wants as the final blow, I've realized that it's actually just not tracking progress properly. Has anyone else noticed this bug? And while we're on the topic anyway, why do the Perfect Fifth rounds expire? That seems like a major hindrance to an already somewhat underwhelming perk.[/quote] Not a bug. You need to kill them with the burn of the explosion. Go to the castellum in Leviathan and farm the normal cabal. Three headshots on one the last on another.