"Ah, welcome to my cozy hideaway, Guardian.
"Ikora said you'd be coming, told me what's what. Sounds like you're looking for a weapon frame, one of Cayde's old treasures.
"I'm happy to help, but there's a bit of a snag. The former Hunter Vanguard was notorious for hiding his goodies behind elaborate puzzles; in this case, that meant splitting his treasure map into separate components and squirreling them away.
"Unfortunately, that was a long time ago, and I believe the Fallen have stolen the components. Hard to finish the jigsaw without all the pieces, eh?
"You raid some Fallen Lost Sectors, I bet you'll find what you need. Cheers, and good luck."