Xur is back in the Tower this weekend and he has something extra special for Destiny players, an exotic rocket launcher called Gjallarhorn.

Xur can be found in the Tower at the bar near the jukebox. He will remain there until 5 a.m. EDT Sunday.

The Gjallarhorn rocket launcher is extremely powerful, but extremely rare. Even when players completed high-level activities, Gjallarhorn would almost never drop, The Verge Reports.

This is the first time since the week Destiny came out that Xur is selling the Gjallarhorn, so players should certainly take advantage of it and buy one.

The reason why the Gjallarhorn is so powerful is because of a perk called "wolfpack rounds." This perk allows homing missiles to be fired out of the rocket. The missiles track targets after they are fired and cause additional damage once they locate the targets. Gjallarhorn can be purchased for 17 Strange Coins.

The Insurmountable Skullfort Titan Helmet can be purchased for 13 Strange Coins. It provides a discipline rating of 127. 

The Achlyophage Symbiote Hunter Helmet can be purchased for 13 Strange Coins. It provides a discipline rating of 125. When equipped with this helmet, players will be able to throw grenades farther. Super energy will also be replenished when killing an enemy with a grenade when this helmet is equipped. Finally, the Golden Gun will gain one additional shot with this helmet.

The Light Beyond Nemesis Warlock helmet can be purchased for 13 Strange Coins. It provides a strength rating of 126. When using this helmet, melee attack speeds will be increased. Additionally, Defense Power will be increased with this helmet, allowing it to absorb more damage. Each time an Orb of Light is picked up, health will be replenished.

For the full list of items that Xur is selling, including weapons and Curios, visit the Reddit Xur thread.