Siren

The Siren is the first Boss of the Cove.

Ancestor's Memoirs: The Siren
"My lofty position wasn't always accompanied by the fear of office, and there was a time when I could walk the streets or raise a glass in the tavern without concern for molestation. Faithful as the tide, one precocious village waif made it her hobby to shadow my every errand. It was charming then, troublesome later. In financial desperation, I struck a bargain with the ancient things that surfaced in search of sacrifice when the moon was right. Their price was the delivery of an obscure idol and one other item of more troubling portent. The pact struck, my new-found accomplices slipped silently beneath the brackish water. A fearful stirring at the edge of the torchlight betrayed a familiar witness and gifted me with malign inspiration. Under the blood moon, I lured my wide-eyed prey to the pier's edge. Before she could properly appreciate her position, I clamped down a manacle, chaining her to the leering idol. A small push was sufficient to send both into the icy waters. And, when at length the tide receded, jewels of the most magnificent grandeur lay scattered upon the shore."

History
Before he went fully off the deep end, a young village lass had a crush on the Ancestor, and followed him everywhere he went. While he originally found it charming, she eventually became a nuisance when his darker and more secret experiments were going on. When he needed some extra money, he gave her to the Pelagic fish-men who infest the Cove. Now, she is their queen... and their slave.

Behavior
She Appears on space 1 and has high bleed resist, 120+ hp, and can charm your characters, who join her side (they return to the party after a few rounds). She also appears to summon warriors to assist her. If your party flees the raid while a member is charmed, they die.

Abilities
The siren will use a move called Song of Desire to attempt to charm members of your party to her side, while this can fail it will more likely succeed and your character will go to her side. As a note after a few rounds they will return to your side. When charmed they will use more basic attacks even if that hero does not have access to them (Mace smash from the Vestal and wicked slice from a highwayman for example)

She also summons random monsters with her High Tide ability.

Strategy
Focusing her down to end the fight quickly is viable but since most of her damage comes from her summons and charms it is totally possible to slowly whittle her down. Using Uppercut from the Bounty Hunter or blackjack from the Hound Master on your charmed character will not overly damage them but keep them from doing to much damage to your other party members. Her summons however should be dealt with quickly as they can easily boost/guard her or stun your already weakened team.

The charm attack counts as a debuff, so using an item, trinket, or skill that increases resistance to debuffs will increase the chance that the skill fails to register. In particular, having the entire team use Holy Water before the battle will make the first few rounds much, much easier. Charmed Hero will suffer some stress for each turn they are under Siren's influence and will return to the 4th rank of the party after a few turns.

Avoid stacking damage buffs on a single party member and bringing the Man-At-Arms, as his abilities offer little assistance against a Siren's attacks, and if he is charmed, he can stun, use buffs and place a Guard effect on the Siren, forcing you to stall, waste a turn stuning him or even kill him.