Asura · All traditions · Pan-India
Alarka
A blood-drinking worm with eight feet that bored Karna's thigh while Parashurama slept on it; in truth the asura Dansha, cursed by Bhrigu and freed by Parashurama's look.
Sources: Mahabharata, Shanti Parva 2 to 3, tr. K. M. Ganguli · see Alarka's web