Origin
When Hermia Jadis (tall blonde) comes in and snatches up a bracelet from a display, putting it on. Clark tries to stop her, and she yells at him, then senses that he “seethes with vitality”.  She tells her current husband to go drown himself in the river as she has “no more use,” for him. She said “that power, my new, intrusive conquest, will be mine”.
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Filled with Clark’s vitality, she clocks Diana and runs off with Superman. Lois and Diana try to figure out what the hell just happened, and Diana figures out that Hermia is Khyrana the Accursed.
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Khyrana was a woman who lived in ancient Greece and was renowned for her beauty and her solitude. When Zeus offerred to spend some time together, she refuses. Outraged, Zeus curses her with the need for the touch of others in order to live. She spent the rest of her time trying to lure others to feed on them.