Master Vampire Armor as a costume, like the armor from Skyrim.
The Vampire Lord form, as a polymorph, either a crownstore item, or a DLC reward for something in the future.
Lamae shrine as a house decoration for large homes. (Note, why not make a shrine for Vamp and Wolf that is a house item, that is active?)
Increased undercroft bodies selection, more dead bodies for decorations which would help enrich both RP player's homes, as well as just giving a more creepy vibe.
NPC thralls for homes.
Blood Fiend/ Vampire NPC's for homes. ( Such as a nobles pack, which has Vampire NPC's that simply stand around for decor as well as possible merchants for homes ) With account unlock for all homes.
Blood pool pit.
Gargoyle training dummies.
Blood fiend training dummies.
Vampire bat non combat flying pet.
Non combat baby gargoyle