Vampires

Vampires are a race of humanoid beings that feed on the blood of humans. The vampires, despite being former humans themselves, look down on humans and consider them mere livestock.

Founders
Founders are shown to be the same as royalty among the vampires. They are quite powerful and their power depends on their number placement for being a Founder, as shown when the Third Founder, Krul Tepes, easily severed the arm of the Seventh Founder, Ferid Bathory.

Nobles
The Nobles are high class vampires who are far stronger than the average vampire and wield stronger weapons.

Common Vampire
Common vampires are vampires who are neither Founders or Nobles. They seem to be weaker than the higher classes, but remain stronger than humans.

Law

 * Vampires are forbidden from any meddling with the Curse of the Seraph.

Aging
The vampires are shown to be immortal and ageless as the Founders Kururu Tepes and Felid Bathory and Lacus Weld showed no discernible sign of change from their image four to eight years ago. However, Mikaela Hyakuya who was turned into a vampire four years ago was shown to have aged and looked the same age as his friend Yūichirō Hyakuya. The reason for this is due to Mikaela's refusal to drink human blood, thus preventing him from turning into a true vampire.

Strengths
Their strength is 7 times that of a human being.

Weaknesses

 * They can be killed if their head is destroyed
 * They can be killed by the ultrasonic waves if  their armband device is removed.

Trivia

 * They refer to the humans as "livestock" instead of calling them by their names or simply "humans".