This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Liderc (Hungary)
In Hungary there is a vampiric creature that drains off the blood and life energies of a person through called a liderc, it is created in the most interesting way—by placing the first egg laid by a black hen under one's armpit and keeping it there until it hatches. The liderc also acts as something of a familiar, as it is known for its ability to find treasure.
It can shape-shift into a chicken or into a person who has one foot that is a chicken's foot. The only solution is to keep it busy with tasks; otherwise, it will destroy the occupants. The flickering light liderc is a ball of light that hovers over the household where someone will soon die.