From what I have seen, Fragment XLVI is dropped as a reward for completing a Nightfall strike. I have completed a Nightfall strike recently (S.A.B.E.R.), but did not get XLVI. Does anyone know any specifics on this fragment and completing a NF strike? (i.e. Does the NF strike have to be either Sunless Cell or Shield Brothers?) I have 41 fragments collected so far and am trying to get the rest of them, so I was hoping that someone might be able to provide some help/insight.