Centuries ago, the fae dwelt in Underhill. When they were cast out, they left behind their great castles, troves of magical artefacts . . . and their prisoners. Without the fae to mind them, those creatures roamed freely through Underhill wreaking havoc. Only the deadliest survived.
Now one of those prisoners has escaped. It can look like any creature it chooses and if it bites you, it controls you. It lives for chaos and destruction and can make you do anything - even kill the person you love the most. Now it is here, in the Tri-Cities. In my territory.
It won't - can't - remain. Not if I have anything to say about it.