This quest is not available in game.
Kill the Demon of the Orb, then speak with Tabetha.
Now that we have a summoner's orb, we must exorcise the demon within it. I can do that. That's the easy part.
You're the one who has the hard job. You're the one who has to kill the demon once it's out.
And you'll have to be quick. If you take too long then he'll jump back in the orb and we'll have to start over!
So get yourself ready. Prepare your strongest spells and keep your potions handy, and go get a friend if you have one. Because this isn't going to be pretty.