Vampires

Blood-drinking
Vampires must drink human blood to survive, and are usually unable to consume any other food.

Powers

 * Revive from death in the moonlight
 * Great physical strength
 * Ability to create more vampires

Weaknesses
Vampires can be 'killed' by the following: They will stay dead unless they are reached by moonlight, which revives them.
 * Drowning
 * Gunshot
 * Hanging

They can also be decisively killed by volcano.

Vampire community
Vampires recognize one another, and are required to officiate at the birth of a new vampire. However, there is little sympathy between them. Varney expresses disgust at the way which one new-born vampire behaved in life.