I did 20 vanguard strikes in a row, about 7 of them being either Ta'aurc, the Flayers, or the Shield Brothers. Treads Upon Stars refuses to drop. The game teased me and dropped a legendary from Ta'aurc, but it was only a legendary class engram. Should I be doing something different? I want this gun so much. Edit 1: I finally got it! Valus Ta'aurc thank you! It's on my hunter if you want to see it. Not the best rolls but I got it!