Sirens are speculated to be related in some way to selkies, but while selkies have been known to sabotage and even murder, they always do so using mundane tools and trickery. Sirens, on the other hand, use a form of song that seems to compel obedience in the listener—one that the Collegium has been unable to fully explain or reproduce. While blocking a siren’s song is possible, hearing the least note is extremely dangerous as sailors have been driven to self-mutilation and even suicide when hearing a siren’s song but being unable to act upon it. In their natural habitat, sirens appear to live amid normal tropical seals as one of them, only emerging and singing during certain phases of the moon—seemingly taking and eating live prey just before they breed.

Despite their high intelligence, and the obvious grasp of human language demonstrated by their lyrics, communication with sirens—unlike selkies—has proven elusive. So far as can be ascertained, they have no interest in human affairs beyond their need to consume a blood meal before breeding. Indeed, they will often mimic other creatures as well in order to devour them, though the song “sung” by a siren to attract a gibbon, and the form it assumes whilst doing so, are unlikely to tempt any human observer.

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