She's the current host of the Blind Godess/Blind Mother/Crimson Queen/Red Crone (an ancient Elf Goddess of massacres, death, destruction, rebirth, necromancy, blood, vengeance, chaos, madness, and destructive lust. Some of the nastier side-effects of being her host are: a sudden interest in no-holds-barred homicidal sadomasochism, all coherent speech becoming shrieks and giggles, and descent into varying degrees of madness. Elyssa has ALL of those things!)
Star has already said that he married Elyssa for love a long LONG time before the Blind Goddess chose her, and that he's stayed so longbecause 'the real Elyssa is still in there, and I'll love her until the night she kills me'. Eyssa and Star agreed centuries ago that men don't count for him, and women don't count for her. As long as Elyssa is the only woman in Star's sex life, and Star is the only man in Elyssa's sex life, they can bed anyone.
Since this was decided long before hormone therapy and sex-change surgery were invented, it may need an update of terms... But Elyssa cant't talk anymore, so problems.
Her powers include telekinesis, levitation, flame manipulation, electricity manipulation, telepathy, earth manipulation, healing factor, blood manipulation, mind control, power-from-pain, power-from-pleasure, hypnotic voice, flesh-to-blood and vice versa, turning into one or more bats, transformation into one or more red butterflies, transformation into a cat, sharp fangs, enhanced senses, superhuman speed+strength+agility, immortality, control of bats, control of winged insects, and the ability to posess inanimate objects/substances.
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-WHEW!-
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The flame manipulation, electricity manipulation, butterfly transformation, and control of winged insects were her powers before she was transformed into a vampire.
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The telekinesis, levitation, telepathy, mind control, power-from-pleasure, bat transformation, cat transformation, fangs, enhanced senses, superhuman speed+stregnth+agility, immortality, and control of bats were powers she obtained from vampirism.
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EVERYTHING ELSE was a gift of the Blind Goddess, and only usable because the Blind Goddess is still inside of her.