Fallout meets Five Nights at Freddy's with this New Vegas mod

There's a Fallout: New Vegas mod called Five Nights at Vault 5 based on the Five Nights at Freddy's series. It is a complete, fully voiced mod where the player encounters an abandoned Vault containing a “fully functioning Arena.” It was developed by modder ZuTheSkunk, who explains the Arena was created by Vault-Tec as a