The Adder of Lykos

The Adder of Lykos is a character in "The Crown and the Flame". She's got her first appearance in book 2, chapter 7.

Look
Adder has long black hair, brown eyes and tan skin. Usually, she wears a golden dress, a gold necklace, and a Snake bracelet.

Personality
She is said to be extremely ruthless and vicious and is the Queen of Lyko's Criminal Underworld. Her main weapons are daggers dipped in Snake venom, which is how she got her name.