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The Siren is a female monster from Classical Mythology, best known for using its hypnotially alluring voice to lure men to their deaths on jagged rocks. Due to various conflicting descriptions, sirens have often been confused with or even combined with the harpy or the mermaid in many /tg/ media.
The siren first appeared in Advanced Dungeons & Dragons as the Sirine; a nymph with a deep spiritual connection to the sea. Described as often having yellow-green, green or blue skin and silver or dark green hair, they are an isolationist and contemplative species, caring for little more than to find themselves a secluded den close to the sea or on the sea where they can sit, think and sing. They want nothing from society and contribute nothing to it, except maybe misery by their lashing at out people who disturb them. They can cast Charm Person 1/day via their song, causing it to affect every listener within 30 feet, and can use fog cloud, polymorph self, and improved invisibility 1/day each; all of their spell-like abilities are cast as if by an 11th level mage. They can also reduce anyone foolish enough to let them touch them to babbling imbeciles, dropping their Intelligence down to 2.
Sirines would later make their way to 3.5 in the Monster Manual 2.
In Birthright, where most monsters are unique creatures, the Siren is actually a bit odd among awnsheigh in that she isn't a horrible murderous monster. Once a normal singer with minor Azrai blood, she was tainted, Phantom of the Opera style, by a mysterious tutor who lured her into the dark world and brought her bloodline powers to the forefront, rendering her incapable of speaking without blasting everyone in front of her with a huge cone of sonic damage. Resisting the dark urges of her Azrai bloodline, the Siren ended up wandering, accidentally destroying a few barns, until she happened upon the Dusk Man, another awnsheigh and a brutal tyrant, engaging in the traditional awnsheigh pasttime of rapacity upon a local family. They briefly contested powers, and then she gigged him in the heart when he started monologing about how her strength would soon be his. Now, she's the ruler of his holdings.
Life's rough there, but she has a tight-knit court of supporters who love her to bits, absorbing his power stabilized her own (though not the the point that she can speak without hurting people; she uses a sign language devised by her courtiers and written words to communicate), and she's even fallen in love with a ranger who recently moved in.
In Plane Shift: Ixalan, sirens - interpreted here as a harpy-like race of bird-people with both male and female members, all of whom can produce supernaturally charming song - are presented as a playable race for Dungeons & Dragons 5th Edition. They have the following stats:
- Ability Score Increase: Your Charisma score increases by 2.
- Size: Sirens stand about 5 to 6 feet tall, but their bodies are slender and their bones partially hollow to facilitate their flight. Your size is Medium.
- Speed: Your base walking speed is 25 feet.
- Flight: You have a flying speed of 30 feet. You can’t use your flying speed while you wear medium or heavy armor.
- Siren's Song: You know the Friends cantrip and can cast it without material components.
- Languages: Common and Siren
In the Odyssey of the Dragonlords setting, sirens are a tragic race of coastal bird-people, looking like humans (both female and male) with wings with scaled limbs that end in prehensile talons. Believed to be descended from a nereid who fell in love with an avian celestial, sirens are not amphibious, but are well-adapted for living in and around water. Their artworks, poetry and architecture emphasize their special releationship with both the clouds above and the sea below. Once, sirens dwelled in a great and beautiful city, where they spent their days singing praises to Sydon, the Titan who governs the ocean. Unfortunately Sydon is a vindictive, vainglorious prick who is never satisfied; he chastised the sirens as vain, selfish and hubristic for daring to build tall towers and to offer him songs instead of blood sacrifices, an act that shocked and mortified the sirens so badly that their entire city crumbled into nothingness and was swallowed by the sea. Many of the sirens went mad, and were corrupted by Sydon's sister-wife into the bloodthirsty harpies that now bedevil the coast. The survivors still dwell in small flocks along the shoreline, afflicted with a racial curse of manic-depression as a result of Sydon's pointless cruelty. One day, a siren may experience extremes of joy and hope - only to then fall into soul-crushing sorrow and pessimisim as she succumbs to the grief planted in her very soul.
Thylean sirens are a playable race with the following stats:
- Ability Score Modifiers: +2 Charisma, +1 Dexterity
- Size: Medium
- Speed: 30 feet
- Vision: Normal
- Enthralling Voice: You gain Advantage on Performance and Persuasion checks made with your voice.
- Powerful Lungs: You can hold your breath for up to 1 hour.
- Wavering Emotions: After completing a short or long rest, you must decide if you are experiencing Unbridled Joy or Unrelenting Sorrow. If you are experiencing Unbridled Joy, you can use your Flight ability. If you are experiencing Unrelenting Sorrow, you can use your Songs of Sorrow ability. You cannot use an ability if you are not in the proper moodset.
- Flight: You have a Fly speed of 30 feet, but cannot fly if wearing Medium or Heavy armor.
- Songs of Sorrow: You can cast Charm Person, Enthrall (from 3rd level) and Hold Person (5th level) once per short rest, using Charisma as your spellcasting ability score. These SLAs all have the Vocal component, as they use your singing to function; a creature that can't hear you sing is immune to these powers.
In Pathfinder, the Siren is a distant relative of the Harpy, appearing as a huge female bird of prey with the head of a gorgeous human woman. They are natural oracles and wield powerful enchantment spells through their voices. Relying on human men to reproduce, unlike their man-eating cousins, they are actually devoted spouses who fall passionately in love with the men they select; sirens have been known to literally die of grief if they are separated from a mate they have selected.
Naturally, the siren has appeared as a monstergirl in many, many depictions. That said, they re usually just portrayed as either mermaids or harpies with bard-like magical powers; even the Monster Girl Encyclopedia settled for just depicting its siren as a pop idol-themed harpy.