Vampires

Vampires are a race of bloodsucking undead found in several if not all places around the world.

Weaknesses

 * Weakened and progressively damaged under direct sunlight (Nullified by bloodstone)
 * Allergic to garlic (Behaves as a typical severe food allergy) (Nullified by bloodstone)
 * Paralyzed, weakened, or killed after consuming a dead man's blood, depending on the quantity (Nullified by bloodstone)
 * Allergic to wood from an ash tree (Causes painful rash and promotes bacterial infection)
 * Allergic to blessed silver (Behaves as a typical severe metal allergy)
 * Highly vulnerable to fire
 * Damaged by healing magic

Strengths

 * Extremely fast, extremely strong, and able to move completely silently
 * Possess highly refined senses
 * Able to "see" scent trails
 * Sole practitioners of the long-lost pre-apoc art of blood magic
 * Among the very few still knowledgable of the long-lost pre-apoc art of transmuation magic
 * Extremely fast healers (Not instantaneous)
 * Unaging
 * Pretty much immune to bloodloss
 * Able to absorb large amounts of Mako from a bitten victim while drinking their blood
 * Able to combine their knowledge of transmutation and blood magics to produce a variety of very powerful unique spells
 * Healed by otherwise damaging spells that have no elemental affinity

Culture
Vampires are pack hunters by nature. Their culture reflects this, as vampires tend to stick within their "families" or "clans", and usually only associate with other clans in times of great need, or briefly to associate treaties, wars, border disputes, etc.

Vampires adhere to a strict code of secrecy known as The Masquerade. The Masquerade states that no vampire should ever do anything to reveal the existence of their race to the general public. In conjunction with the vampire race, the Hellsing Organization does its best to work towards the survival of The Masquerade as well, by specifically targetting vampires who break the code, and for the most part, this enforcement helps keep the veil of secrecy relatively intact.

One thing that trancends the clan-barriers however is that age, in addition to directly effecting power, determines how respected--and often feared--a vampire is.