First legendary was.... uhm... Shit I can't honestly remember because my first anything was an exotic primary from a Legendary engram. The Last Word. All down hill from there. If I had to guess, it was the Nerigal Savant III warlock helm. Which I'm about 90 percent sure of because I remember it being the first piece I bought. It was either the helm or the Nerigal Savant gauntlets which dropped from a blue engram (early rahool liked me for a while) and j can't remember which came first