Tone Deaf Siren is the third Season 2 Ship Graveyard story battle. The boss of this battle is Slithering Mare. The related story for this battle is One-Sided Romance.
Slithering Mare is a siren with two types of debuffs via songs. The first debuff that she uses has a green glow, and makes nearby players dance on the spot. Mashing the forward movement key can break the debuff early. The second debuff causes nearby player's movement controls to be reversed. Slithering Mare can spin up to three times in a row to attack or slash forward once or twice. When she is between 3-4 bars of HP, Mare's torso will glow red. Dealing enough damage to her torso will break the glow. While Mare is red, her spin attack will hit harder and add in more hits. Mare will also be more aggressive, making her very dangerous.
This is a story related battle, and can only be hosted by a player currently on the story. It can only be hosted and completed once by that player. If another player hosts, someone who has already completed the story will still be able to join. You must choose the difficulty that suits your character's level for the story. If the story is completed, you may choose to join any difficulty. If you have not unlocked the related story for this battle, you will be unable to join it.