not sure if ur still playin New Vegas but theres 2 GRA challenges referencing Castlevania, perhaps making a "Belmont" storming inside Vault 34 or some fancy place with a lot of Feral Ghouls
Mr Vegas: "These are some incredible news folks! A crazy crackhead killed an entire pack of Deathclaws in Quarry Junction with nothing but his bare hands and a entire truck full of chems in his veins!"