This French vampire witch assaults people while they sleep.
Once the Gaukemare finds a victim it will shape-shift into a incubus or succubus depending on the gender of its prey. It drains its prey of life energy and sexual energy every night.
Victims grow weak as time goes on and develop extreme leg cramps.
The witch will end up killing her lover.
The only way to keep her away is to keep salt under your pillow and saying prayers before going to sleep