The Vârkolak was an undead creature which fed on on the blood and flesh of living creatures — usually humans, but it also attacked animals. Ladies would often end up being sexually assaulted by Varkolaks, later giving birth to children by them. The Vârkolak was invisible and hunted only at night. Far from being undetectable, it would leave footprints, and could be seen with infrared night vision goggles. Folklore had it that the child of a Vârkolak (called a Dhampir) could see it, and that such children frequently became Vampire Hunters.