Siren

Siren is a strange harpy monster who attacks Luka while he’s on his way to Captain Selene’s Ship in Chapter 2. Sirens are very infamous for their luring songs.

Monsterpedia Entry
''“A powerful bird monster that roams the Northern Sea. Using her seductive voice, she tempts sailors to her, and then extracts all of their semen. Due to the potential for loss of life, experienced sailors usually travel with earplugs.''

''Though they usually act alone, Sirens have been known to wait in groups on rocks to attack gigantic ships. With her high quality vagina and seductive voice, the Siren can easily overpower a man in ecstasy in mere moments. In trade for this pleasure, the man is milked until his death.”''

Attacks
Feather Caress: Normal attack.

Feather Wingjob: Normal attack.

Chest of Pleasure: Normal attack.

Mouth of Fascination: Normal attack.

Armpit Squeeze: Normal attack.

*Song of Seduction: Triggers temptation and bind status and deals damage. Leads immediately to Thirsting Vagina.

Thirsting Vagina: Binded attack which leads to a one hit KO via instant follow-up.

Battle Overview
Her scariest ability is her Song of Seduction. As soon as it is heard, Luka will meet his doom. To defend from it, use Sylph, or quickly get the battle over with using Undine + Serene Demon Sword. As long as the song is avoided, there isn’t much to be afraid of.

If Luka loses, she mounts him and rides him cowgirl style during vaginal intercourse. Afterwards, he’ll be forced to mate with her endlessly.

Trivia

 * Siren is the only harpy to become sealed.