Here's a badass for your world building inspiration. Imagine this little charmer tearing through your fantasy world.
The abaasy are alleged to be the spirits of the long-time deceased who dwell near graves or in deserted places who otherwise travel about causing destruction. They serve Arson-Doulai, the ruler of the dead, who also swallows people' souls and gives them living diseases.The abaasy can be appeased by blood sacrifices. They inhabit the underworld also known as the "kingdom of darkness". They travel in packs of seven and their blood is poisonous.
The abaasy are described as one-eyed, one-armed, one-legged monsters mounted on two-headed, eight-legged, two-tailed dragons as steeds. In olonkho, a heroic epic tale of the Yakuts and one of the oldest epic arts of the Turkic people, they are ugly and horrible man-eating beings. Their chief is a three-headed, six-armed and six-legged giant with body made of iron.
These mythical creature seems to be popular in Role Playing Games.