Xûr

Xûr, Agent of The Nine is a strange being who occasionally appears from time to time, selling strange weapons and armor to Guardians. He serves the ancient beings known as The Nine.

Gameplay
In Destiny, Xûr is a vendor who sells exotic weapons, exotic armor, engrams, Exotic Shards, and consumables in exchange for Strange Coins and Motes of Light. He appears in different locations in the Tower and Vestian Outpost every weekend from 9:00 AM Friday to 9:00 AM Sunday UTC. The Agent of the Nine disappears every Tuesday at reset and won’t return until next Friday.

In Destiny 2, Xûr can appear in the locations The Tower, European Dead Zone, and Nessus from 9:00 AM Friday until the next Weekly Reset on Tuesday. Instead of Strange Coins, Xûr accepts Legendary Shards in exchange for Exotic weapons and armor. Now Exotic Ciphers

Possible Merchandise
Xur's items vary each week; every time he moves to a different location. The types of weapons he gives vary from solar, void, and arc. The only type of merchandise that does not change are fated engrams and his quest steps. The prices go up occasionally.

Trivia

 * During Halloween 2014 and 2015, Xûr sold Flight of Shadows.
 * For the first few hours of his second week in the Tower in Destiny, Xûr offered Strange Coins in exchange for Spinmetal and Spirit Bloom.
 * This was immediately removed by Bungie due to players taking advantage of this system to acquire large quantities of Strange Coins.
 * After Destiny Update 1.1 was released, Xûr began selling upgrades that increased an equipped exotic weapon's Attack Power from 274/300 to 302/331 or an equipped armor piece's Light attribute from 21/30 to 30/36.
 * This was removed in Update 1.2.0.1 because weapons and armor were able to ascend instead.