I have been playing for a while now; about 205 hours. Although I appreciate Xur, I find that I get most weapons and armor that he has to offer, in strikes.
I would like to pose a couple of suggestions, instead of or along with Xur :
[b]Requirement:[/b]
Complete all daily missions for a week and the weekly missions.
[b]Possible Rewards:[/b]
1) A ticket that the player can turn in to the postmaster, for a legendary mail piece. What I mean by that it, it will guarantee at least 1 legendary item.
[i]or[/i]
2) Create a loot cave that requires a lottery ticket, in order to instance. A player who completes all daily and weekly missions for the week, gets a ticket that permits them to enter this cave. This cave will spew out endless hordes for a certain amount of time. Killing them is guaranteed to drop engrams, for every kill. For example, DC Universe lottery ticket system. Xur could even be the architect of the loot cave.
[b]tl;dr: Create a reward system for players who complete all daily missions for the week, and weekly missions; loot cave lottery or mail piece with a guaranteed legendary item.[/b]
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I like the idea of a loot cave, but make it so you have to fight in like a arena style ring. So enemy will come from all areas. And once you die, you'll need another ticket.