Get rid of this off of the Pathfinder. It doesn't work I don't know how many ignition kills I've gotten that it isn't counting. Either it doesn't work properly or it takes way too many kills to progress
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I did it on Hunter. I used the Super Ignition fragment one time before, but I was also able to do it with the Weighted Throwing Knife since it Ignites Scorched targets. From my experience, it seems Ignition kills from abilities are what register for the Pathfinder objective.