A clan by the name of PrimeGuard has beaten Destiny’s first available raid, The Vault of Glass, just 14 hours after Bungie made it available to all.
The developer posted a congratulatory tweet to PrimeGuard, and challenged them to try it on the Hard difficulty.
— Bungie (@Bungie) September 16, 2014
Vault of Glass is a Raid, a 6-player event that consissts of multiple segments. Its progress can be saved during the week, so you can return to it later, provided you follow the same Fireteam leader.