A castle (possibly randomly-generated) filled with vampires.

Vampires:

• look like human mobs, but pale
• each hit drains your health and they regain a portion of it
  • in light of this, their gear should not be diamond
• weak to fire
• catches on fire in sunlight
• holy water will set them on fire and lower their defenses, so they take 1.5x damage

The vampire boss will always be in the basement with a 3-thick obsidian roof to make it more challenging to get sunlight on him. Would be cool if he also has a chance to drop an iron sword with Life Drain on it.

The Sun villages will sell holy water or have some way of turning splash potions of water into holy water.

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