The lamia's innate spellcasting ability is Charisma (spell save DC 13). It can innately cast the following spells, requiring no material components.
At will: disguise self (any humanoid form), major image
3/day each: charm person, mirror image, scrying, suggestion
The lamia makes two attacks: one with its claws and one with its dagger or Intoxicating Touch.
Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 14 (2d10 + 3) slashing damage. Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.
Melee Spell Attack: +5 to hit, reach 5 ft., one creature. Hit: The target is magically cursed for 1 hour. Until the curse ends, the target has disadvantage on Wisdom saving throws and all ability checks.