Lyncathropy

Lycanthropy is  a natural occurring supernatural virus that originates from the first and original werewolves.

Lycanthropy triggers a transformation into a wolf-like humanoid creature, or a larger quadrupedal wolf. These transformations tend to be triggered by the phases of the moon (typically a full moon). This transformation will continue to be triggered each night the moon is full regardless of cloud cover. Although their strength, speed, and aggression is lessened by a thick cloud cover. A full moon, in terms of werewolf transformation, is defined as 80% or more of the moon's surface illuminated by the sun. However, this is only the minimum requirement, and only a small number will transform.

Generally the newer werewolves will transform unwillingly. With age, resistance is formed, and more moon illumination is required to achieve Lycanthrope status. With each percentage point of lunar lighting the number of werewolf transmutations increase greatly, reaching it's peak at 100% full moon. Werewolves can transform as the sun sets sometime within Nautical Twilight if the moon is visible. Since there is still daylight the minimal sunlight will cause them to stay in deeply wooded areas or even caves. The vast majority of werewolves reside within Astronomical Twilight where their power is strongest. The peak of their power comes at midnight otherwise known as the (be)witching hour. The subject remains a werewolf until nautical twilight just before the sun rises. The rising sun triggers the de-transformation back to their human form. However, this isn't always the case. Some werewolves can transform at will and maintain their transformations as long as they wish. However, their power still relies heavily on the phases of the moon and transformations in pure daylight often causes extreme cuts in power.