So I was R I G H T... kind of, anyway lol
Tara is indeed involved in some way, but my current guess is that she's still a normal human BUT with a lot of potential as a magic user. Either that or the next scene after that one is this pendant turning her into a succubus or something like that, like Nightcrawler from X-Men but reversed. Don't mind me, just leaving my dumb theories 'cause I'm in love with this game.