Lamia

Type	Enemy
Environment	Underground Desert + The Corruption Underground Desert + The Crimson
AI Type	Fighter AI
Damage	52/104/156
Max Life	350/700/1050
Defense	28
KB Resist	65%/69%/72%
Banner	Lamia Banner(Desktop, Console and Mobile versions)
Immune to
Coins	6 SC15 SC
Hurt
Killed

Type	Enemy
Environment	Underground Desert Underground Desert + The Hallow
AI Type	Fighter AI
Damage	52/104/156
Max Life	350/700/1050
Defense	28
KB Resist	65%/69%/72%
Banner	Lamia Banner(Desktop, Console and Mobile versions)
Immune to
Coins	6 SC15 SC
Hurt
Killed

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Lamia is a Hardmode enemy that can only be found in the Underground Desert biome. When found in regular or Hallowed Underground Deserts, it has pale blonde hair and has a chance to drop the Sun Mask. Corruption/Crimson Underground Deserts will spawn an alternate variant having much darker hair than its normal counterpart. The "corrupted" version has a chance to drop the Moon Mask.

Both variants have a rare chance to drop a piece of the Lamia set.

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. Lamias, portrayed as vicious snake women, have since become a staple of fantasy media.
The Lamia Banner appears to portray the darker version of the Lamia found in Corruption or Crimson Underground Deserts.

The Bestiary entry for the Lamias: "By the time glowing red eyes appear in the darkness of the desert caves, it is already too late. The lamias have found their prey."