
The crux of the problem, the end of civilizations, the reason for creating Hunters and the thing that nearly destroyed Yharnam five years ago: the
scourge of beasts. Man-eating monsters possessed by inhuman strength, speed, regenerative abilities and bloodthirst, the worst beasts are living nightmares far beyond the abilities of normal people to fight... yet the power they wield and the danger they pose are not the true thing to be feared.
“...We are born of the blood, made men by the blood, undone by the blood. Our eyes are yet to open..."The scourge of beasts is not an ephemeral presence of monstrous creatures that appear out of nowhere; in truth, the scourge of beasts is a disease... an infection that corrupts the bodies and minds of its victims from the first time they receive the Yharnam blood. From the moment they feel the euphoric stupor of the Old Blood the first time, every person is destined to one day lose their mind and transform into something... else. A bloodthirsty beast, thinking their fellow men nothing but a source of sustenance.
One thing all beasts have in common is their adverse reaction to the
incense of the Healing Church. This incense, which is one of the only things known to be able to mask the intense stench surrounding beasts and Hunters, causes beasts intense discomfort and make them instinctively avoid the scent, making it a vital tool for Yharnamites to survive when beasts are near. Hunters, luckily, do not react to incense, but tend to shy away from it nonetheless simply because incense wards off beasts... and Hunters should hunt.
The exact shape this beasthood takes varies quite a bit, and only some variations can be explained to a degree by the experts from the Healing Church. The most common and "basic" manifestation of the scourge of beasts is
lycantrophy... or at least what appears to be so. In common Yharnamites these beasts will typically mutate at a
relatively gradual rate, initially retaining much of their humanity as their limbs elongate and their features grow incrementally more bestial, eventually resulting in them growing
fur, fangs, claws and a bulk of sinuous muscle indicative of their innate predatory nature.
For most, becoming full
"werewolves" is the final stage of beasthood, though rarely, some continue past this stage. Some manage to sustain themselves with enough blood to not only maintain human minds, but to reach the next evolutionary milestone: creatures known among Hunters as
"abhorrent beasts". Hulking monsters of rage and hunger, abhorrent beasts are not only insanely strong and fast, but tap into some eldritch power to create shock waves that could crush ordinary men. Indeed, some abhorrent beasts are even known to be able to shapeshift and imitate humans, making them extremely dangerous predators.
On top of this, another two kinds of lycantrophy can arise from the scourge of beasts: that of the
"cleric beasts", and that of the
"darkbeast". It is a closely guarded secret in the Healing Church that the explanation for the larger, more powerful and often spontaneously appearing cleric beasts is well known to them, and one that causes endless concern. These unusually powerful lycantrophes are members of the Healing Church - often Hunters - succumbing to the scourge, made all the more powerful by the potent blood they have reveled in.
And the darkbeasts... no one truly knows how to explain these. Undead lycantrophes wreathed in lightning, moving quickly, erratically and aggressively, they are the worst lycantrophy has to offer; they kill not for hunger, but for rage and hatred. Fortunately the only known specimen of their kind to appear in Yharnam, Paarl, was destroyed during the purge on the Night of the Blood Moon, but the mere memory of the darkbeasts continue to cause fear - and elation - today.
The darkbeast is also an example of another kind of beast, namely the
undead. How to explain these creatures is generally difficult, since many undead are in a condition that logically should make it impossible for them to maintain vital functions, but they occur nevertheless, even if they are among the rarest of beasts. The prevailing theory is that undead simultaneously suffer from extreme, widespread necrosis and display outrageously powerful regenerative abilities, placing them in a perpetual state not of a risen death, but of near-death. This is also why the threat posed by undead has been noted to vary a great deal, with some being frail enough to dispatch with but a few wounds, and others being so powerful that they are practically indestructible.
An alternative form of undead perhaps not truly deserving of being placed in this category, possibly more fittingly labelled collectively as
bloodwraiths. Taking many different forms, bloodwraiths are for all intents and purposes dead; not near-dead like undead, but truly dead far past the point of biological functions and regenerative abilities. Even so bloodwraiths exist, even though they are dead; called by arcane summons of the mad or obsessed with anger, vengeance and hatred, bloodwraiths are the truest form of blood echoes, trapped in the blood and given form through whichever medium is available to them. Black creatures rise from ash while white specters form from dust; whatever their appearance bloodwraiths are tricky to kill, completely mad and filled with nothing but intense hatred for all living things.
But while lycantrophy is the most common manifestation of the scourge of beasts, it is far from the only one. Another common manifestation is
gigantism, which - as the term would suggest - causes the afflicted to grow progressively larger and larger, gaining tremendous physical strength, but suffering loss of agility and mental acuity. Exactly what causes gigantism is unknown, at least to most, but it can be easily discerned that the Healing Church have a strong interest in the afflicted, as they gather as many of these easily manipulated giants under their control as possible.
Early stage giants are used as enforcers, patrolling Yharnam to fend off the enemies of the church, and
late stage giants are used as guardians of important areas.
More rarely, the scourge of beasts can also affect animals who have ingested people who have received the blood treatment, causing mutations not unlike those found in humans, like gigantism and exaggeration of predatory features.
Pigs,
rats and
crows have been known to grow enormous, in the case of the latter to the point of losing their ability to fly, and whereas
dogs mutate more dramatically until they are
barely recognizable as such.
Though many other, less common types of beast exists, none are as distinctive or noteworthy as the beings known to those who understand their nature simply as "
kin". Beings of innate magical ability and generally alien appearances, kin occur under very specific circumstances... namely to those with great insight into the secrets of the world, and with close proximity to a Great One. Many kin are little more than mindless drones, often hostile to humans or indifferent to them, and are generally incapable of comprehending human means of communication. Whether the different behaviors are due to varying levels of mental acuity, or whether the kin are communing with the Great Ones or not, is uncertain.
Some kin are different, though. While all kin are typically powerful, with resilient hides protecting their vulnerable insides and substantial arcane powers, some rise beyond being simply kin, and are accepted by the Great Ones as true kin, or Kin Great Ones. An example of one such Kin Great One, Rom, was lost during the Blood Moon, as was the triumph of the Choir, the Celestial Emissary, who served as a mediator with yet another Kin Great One, Ebrietas. Though unknown to the public, the Healing Church knew of all of these... and meant to collaborate with them, to hasten the evolution of humanity. Until they were slain, that is.
Finally, beyond beast and kin and any subcategories thereof, the scourge of beasts may manifest in the most twisted, mindless form possible:
amalgamates; multiple beasts and kin that merge together to form singular, semi-coherent beings that are stronger than the sum of their parts. Amalgamates never truly
look like unified individuals as much as just multiple bodies sticking to one another, but they are of one mind and often gain access to unnatural powers that increase in potency the more beings are joined with the amalgamate. The most powerful example of this, known only to some of the Healing Church, came with the church attempting to use the scourge of beasts to artificially force the ascension of a Kin Great One:
the One Reborn, an amalgamate of humans. Other examples of amalgamates include
nests of snakes merging together,
undead creating writhing masses of corpses, and especially snakes merging with humans. The latter is especially remarkable since these human hosts to snakes are usually
consumed by the beasts from within, becoming mere puppets to the snakes, but rarely there have been claims of those who bond with snakes and use them as an extension of themselves, gaining tremendous power.