Just finished Tower Defender, Wasteland Defender and Basin Brawler achievements last night. The meatball was one of the first that I did (Coincidentally as I have since read that it was bugged). The Impasse was my final area. Upon finishing the last needed Overthrow, no Mote of Primordial Light dropped. No weird dying animation. No thrown mote (As others have suggested). I found no "Invisible" mote anywhere in the area (And this area has fall out of bounds very close by...). And my inventory now has absolutely no Motes of Light. 1.) How would Bungie "Fix" this? Redoing all of this content with no guarantee that it'll work a second time is not an option. 2.) Is repeating and starting from scratch even an option? Will the bosses drop a mote of light a second time around? 3.) Is the Exotic Khovistov now unattainable to my character?