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Siren Song is a potent ability possessed by sirens/mermaids only. This power is rooted in their unique voice box: a hybrid of a larynx and a syrinx at the base of the trachea. It's described as almost supernatural; able to lure all who hear it towards the songstress.

It is a melodious, angelic song of vocals, it makes the person feel relaxed and released of all the stress and problems in life, all they want is to hear the song longer and longer, without lyrics to tell those who are enchanted and obsessed with the mermaid who sings it what to do in lyrics. Eventually, the Siren Song leads the person that hears it to hallucinate seeing that mermaid everywhere and hearing their Siren Song out in the ocean. The person will then be driven into the water to find that mermaid, but ultimately drowns to his/her death.

It is eventually revealed that the song leaves something within the brain of human who becomes overly entranced by it. And that is as strongly addictive and calming to the mermaid who sings it as it is to human who hears it afterwards.

Some use a variation similar to it, in an attempt to alleviate bodily pain but not fully heal, as Ryn had with Elaine in "No North Star."

It can also be used as a weapon to harm and kill humans:

The voices from the Merfolk's echo chamber are the viable cure. Once the victim starts listening to it, it will take 2 hours for him/her to recover from the Siren Song.

Users

  • Charles Pownall's Mermaid Lover (in the 1860s)
  • Ryn
  • Donna (deceased)
  • Tia (formerly)
  • Several Mermaids (in Ben's dreams and visions)

Victims

Episodes when Heard

Season 1

Season 2

Season 3

About the Siren Song

Season One

  • "It was more than a hundred fifty years ago when a local fishing captain, Charles Pownall, fell in love with a mermaid in these very waters; enchanted by her beautiful siren song."
  • "You heard the myths about a siren song?"
  • "What did it feel like?"
  • "Honestly. Like a drug. It's like something I need."
  • "Will you sing to me again?"
  • "He asked me to sing. It made him feel better."
  • "Ben asked you to sing to him?"
  • "After party. I sang."
  • "Are we talking about the siren song?"
  • "Do you know what it means?"
  • "My ancestors always said it had different meanings: Great love to some, but to others it could be dangerous. "
  • "Mythologists called it an euphemism for obsession."
  • "My sister, she sang her song to him."
  • "I didn't know my song could do this."
  • "It's the song, isn't it?"
  • "Why did you ask Ryn to sing to you again?"
  • "I didn't know my song would do this. The first time I sang, I am curious about you. It brings us closer."
  • "It did."
  • "I think the song is good, and you asked me to sing again."
  • "Maybe it is too much."
  • "I can't explain it. I don't know what it means."

Season Two

  • "The song. There was something she couldn't explain."
  • "Maybe the song-"
  • "Was it about Ryn and the song?"
  • "Were you hearing it again, her song?"
  • "Your song is his head."
  • "Song is poison like plant."
  • "It's definitely not poison."
  • "Maybe that's we need to do; figure out what it means. Maybe we can block it somehow."
  • "Song only comes when I sing to a human."
  • "What does it feel like?"
  • "Makes me feel good. "
  • "I need it. I want to sing."
  • "The readings are unlike anything I've ever seen."
  • "We got it."
  • "Maddie say song is recorded. No need to sing anymore."
  • "Ever since that thing sang to me, I've never be able to think of anything else."
  • "Looks like you're handling it. Better than me."
  • "I been listening to it. The recording."
  • "Does it help?"
  • "It's not the real thing; it's not nearly as strong, but it helps me through."
  • "When I sing I feel better."
  • "Ryn just her thing to you, and you're acting like it's nothing. I mean, Ben's had this song stunk in his head for, like, the last couple months!"
  • "Ryn has told us before that the song does something for her, too. Whatever it releases, it seems that it's strong enough to push up adrenaline."
  • "If we know exactly how the song's affecting us-"
  • "Maybe we can do something about it."
  • "I can't believe it's real. All the myths about the song- They're all true."
  • "My song do this?"
  • "The question is: why is it doing that?"
  • "It seems to tap into the predal cortex."
  • "Song makes you do things you don't want to."
  • "I think, in our case, it makes us do things we want to do but usually stop ourselves from doing it.
  • "If we could recording the song itself maybe we could look into its affects."
  • "I do this before. Sing for Ben and Maddie."
  • "We been wanting to analyze it, but hadn't had the means."
  • "And she believes going down to this chamber may help with effects of the song?"
  • "This sound, this song or whatever it is, make it your top priority."
  • "This song thing,can you that, too, or is it just a girl thing?"
  • "Because of the song, right?"
  • "I had feelings for her before it happened."
  • "He's been stimulated by the affects of your friend's song."
  • "She'll need to sing again to counter the affects."
  • "Listening to Ryn's mind control stuff again? You gotta let this crap go. It's messin' with your head."
  • "He's received considerable damage from that song. It was devouring his frontal cortex."

Season Three

  • "

Trivia

  • It has different, stronger mind-blowing effects on the one who hears it more than once; from great love to dangerous obsession.
  • It's angelic sounds are effective even through glass and long distances, as proven when Donna sang in the tank she was imprisoned in to seduce Decker into releasing her.
  • Chris reveals that ever since Donna used it on him in "Dead in the Water", he has been unable to cope, unlike Ben, which may be because of the fact that Donna is dead.
  • Following the events in "Mixed Signals" and "Serenity", it has been confirmed that the Siren Song is capable of affecting both human men, women, and even animals due to prolonged exposure.
    • We also learn that upon closer examination, the Siren Song is an amalgamation of multiple sounds made from various species of marine life. The layers range from calm to the most deadly.
  • As revealed by Levi, mermen do not appear to possess the ability to sing the Siren Song.
  • There is one place in the depths of the ocean, where the Siren Song's effects can be somewhat neutralized and its victims healed for a time, although it could only be accessible to healers; such as Eliza
    • When the mermaid who sung the song is deceased, the victim is permanently alleviated from the effects returning them back to normal. 
  • It causes recurring flashbacks regarding the mermaid who sang it, strengthen the negative feelings of its victim and causes hallucinations.
    • Each man of each generation of the Pownall family seems to have already been a victim of the Song of the Sirens.
  • It can be used as a weapon to kill humans. For example: the Russian scientist Alexei weaponized Tia's Siren and the Russian Government used it to kill a group of employees at a Ukrainian municipal office in Ternipol and Tia later used the audio file of her song by calling Xander's phone causing him harm.
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