When you walk through this stone portal, you'll be teleported to Vault 13 just as it was back in the original Fallout (minus the NPCs). Loot the footlockers and lockers for a few trinkets, then grab the one-of-a-kind Solar Scorcher lying on the floor of the vault's armory. To return to the wasteland (and earn 1000 experience points), simply use the beeping computer off to your right.