Stats: (Not really sure what this is asking for) Minimum function size would be 3x3.
Cost: 1500 (Subject to balancing with it's production rate)
Information: This will serve as a replacement for the mana vaults found on tiles in the Dungeon Keeper series. Due to the change in the substance that fuels you're dungeon I suggest that the Gutter is introduced. It's ritualistic appearance, together with the room's crass name would create a very unique WFTO experience.
Function: The room produces extra Blood for the keeper, it's fuelled by your enemies (or not ). Certain creatures produce more blood; magical Heroes being the most effective. Drop imprisoned creatures into the Gutter and watch how they're pinned to a crucifix and drained dry. The "subject" would be kept alive as long as possible, draining them slowly so they can produce more Blood for you to carry out your evil deeds, this would mean they would last a lot longer than in the torture chamber and produce Blood slowly. The Vampire would visit this room regularly if he has nothing to do, especially when upset which would soon increase his mood.
Wall Decoration: The room will appear very ritualistic, with carvings in the stone on every wall. These will be Latin words, and evil symbols.
Appearance: The whole room would look to be made from a slightly darker variation of smooth sandstone. It would have curved grooves in the floor which would collect the blood and channel it outwards to a larger circular gutter that surrounds the "subject". Similar to this picture...
...but without the circles outside the centre circle.
A 3x3 room would have a crucifix in the centre (or similar standing restraint), a bigger room would allow for more crucifixes allowing you to produce more Blood.
Well there's the pitch...what say you?