You've been in the wastelands for a good while now, in 2277 you escaped your home, vault 101, did a lot for the Brotherhood of Steel, defeated the Enclave, spent the next few years working as a courier, and in 2281 get shot in the head, survive, get revenge and helped the NCR win the second battle of Hoover Dam, quite a life you got there, you leave the Mojave and wander to your heart's content, you arrive at the once called Utah, do the locals a few favors, gain some reputation and explore, there you find a vault, it doesn't have a number on it and it's open, so it's most likely empty and filled with goodies for the taking, but just in case you sneak your way while exploring, inside there is a lot of scientific devices and terminals with lots of entries, research of FEV, how it was altered so the individual keeps their intelligence, the last one taking you by suprise, the scientist who made this possible, Amy, tested the FEV on herself, turning into a deathclaw, of all the things you went through and saw, the last one was a sentient and intelligent deathclaw, but as you continue, you suddenly feel a "hand" land on your shoulder, a rather huge, scaly hand with sharp claws... Shit.

Amy: So, you are the sneaky little intruder who decided to break in my vault and snoop around my entries huh? Hm, i know i shouldn't trust you, but something about you seems... Different