So I recently finish the R42 main quest and had a question. At one point, my companion made the comment that the mobs "have something odd around their legs. I wonder..."

After killing them, I noticed there was a sparkling ??? item on the ground, but I didn't have a chance to interact with it before the cutscene started. Afterwards, there aren't any references to what it might have been. I hate feeling like I missed something, so does anyone know what it was? I finished the quest just fine, but was that ??? important in any other way?