After banishing the The Sirens to the human world, Star-Swirl The bearded seen that the 3 singing creature's source of their crime was his own colleague, Forte Luster, who turned out to be the father of the 3 sirens and send the 3 of them to sing out their songs throughout equestria(which they'd failed). When Star swirls discovered Forte's criminal actions, the male hippocampus send his physical self and his soul by using the astral projection within his creation, the omega necklace.