From Dusk Till Dawn 3: The Hangman's Daughter -

Through a ritual, Esmeralda is fully transformed into the vampire princess Santánico Pandemonium.

In the final battle, the Hangman sacrifices himself to kill Quixtla with sunlight, allowing Madrid and Bierce to escape while Santánico remains behind to lead the vampires. From Dusk Till Dawn 3: The Hangman's Daughter

It is revealed that Esmeralda is actually the dhampir (half-vampire) daughter of Quixtla and the Hangman. Through a ritual, Esmeralda is fully transformed into

As night falls, the establishment is revealed to be a vampire haven led by the high priestess Quixtla. As night falls, the establishment is revealed to

The story follows Johnny Madrid, an outlaw who narrowly escapes a hanging with the help of the executioner's daughter, Esmeralda. Along with a diverse group—including a young couple, a gang of outlaws, and the real-life historical author Ambrose Bierce—they take refuge at an isolated inn called La Tetilla del Diablo (The Devil's Nipple).