Lamia

Lamia is a Hardmode enemy that can only be found in the Underground Desert biome. When found in regular Underground Deserts, it has pale blonde hair and has a chance to drop the Sun Mask. If the Underground Desert is tainted with either Corruption or Crimson, depending on which one you have in your world, it will spawn an alternate variant instead, with this one having much darker hair than its regular counterpart. The "tainted" version has a chance to drop the Moon Mask. Unlike other Underground Desert enemies, the Lamia doesn't have a Hallowed counterpart.

Trivia

 * In Greek mythology, Lamia was a queen of Libya who was turned into a child-devouring monster by Hera, the Goddess of Women and Marriage. Lamia as vicious snake women have become a staple of fantasy media.

History
Lamia