Lycanthropia

Lycanthropy is a unique, and particularly nasty, case of curse shifting. Lycanthrope shift is beyond their control, very painful and they lose all sense of self while shifted. Furthermore, it can be transmitted, though very rare.
The shifted lycanthrope form is a combination of canine and human forms, with thick fur, heightened senses and long sharp claws. They are intelligent, but have no recollection of their true self. If, while shifted, bites a victim by their neck and shakes them, the shaking motion seems to release some form of parasite into the victim's blood. If the victim survives the bite, the parasite will enter the bloodstream, spread into the bodily systems and eventually will cause the victim to develop lycanthropy. This process may take few weeks to few months, but so far, there is no method of stopping it.
Lycanthropy does not effect the personality or physicality of its carrier outside of the shifted form, and it is possible to continue living after contracting it. The legendary connection between lycanthrope shift and the moon cycle seems to be false, but their shifting does seem to have a semi-regular cycle, and research shows that they can learn to identify the signs of a coming shift a few days ahead.
The shift generally lasts a few hours, and tends to be characterized more by reactions than calculated actions. There are known cases of shifted lycanthropes with a clear mission to complete, either compelled by an order placed in their mind pre-shift, or instructions given in written form. The ability of the lycanthrope to read and understand such directions prove that their knowledge and memories are locked within them while shifted, but remain out of their reach. There seems to be a complete disconnect between the shifted and unshifted self: the shifted lycanthrope has no recollection of their true self, and the unshifted lycanthrope has no memory of the actions and experiences of their shifted form.
The well reported aggressiveness of shifted lycanthropes seems to come from a combination of an ingredient of raised aggression in the original spell, and the complete bewilderment they experience after the shift. Research shows that the shifted lycanthrope finds themselves in a pain, with no memory of who and where they are, and if they were not alone, they are often countered with fear, shock and aggression. It has been proved, that if the lycanthrope shift occurs near someone who understands the condition and can calmly explain it to the lycanthrope, the chances of attack are reduced to near zero.
The exact origin of lycanthropy is unclear. It is clearly a magical effect placed by a spellcaster, but the originator, their motivations and the methods they used are unknown. The fact that lycanthropy is transmissible, made some suspect that the curse was made in order to create some sort of army: a single shifted lycanthrope could pass the curse to several, and the form of transference assures that only strong bodied could survive and become lycanthropes themselves. However, the temporary nature of the shift does no sit well with the idea of creating an army, and some suggest that the curse was made for personal vengeance: making the cursed person mindlessly attack their loved ones, only to discover the carnage they made when their shift ended. The facts that shifted lycanthropes can have missions, supports the idea of vengeance or the usage of the lycanthrope as a dispensable agent of destruction.

The contradictions within lycanthropy made most scholars agree that the originator of the curse made some mistakes, bringing about unexpected results. Unfortunately, this makes the reversal of lycanthropy nearly impossible.