Proof?...Yes... I see that it is necessary to ease your confusion and suspicion. The ghost pauses How do you think you got here? Did you know your fellow adventures prior to the encounter of the undead? No. I for lack of a better word, resurrected you. Each of you, at one time in your short lifetime, made your way to Daunton when it was once a thriving city. What purpose your travels to the city was, I know not. All I know is that at one time you were there. If you weren't I would not have been able to summon you. And the only way I could have summoned you is if you were...died. You are all the current age you were when you perished.
Vlastoes floats three feet to the left of his position to get a little closer to the witch, then turns to face all three again. I'm sorry if this has come to a shock to you, but it is all for not.
Floating upward two feet and looking down at the three. As you can see...there is nothing left here (pointing his hand upward) but desolate ruins. How would like the opportunity to live once again in the city that was once a thriving city which attracted adventurers from a far. You can live again to follow whatever your hearts desire...and I can return there to do what I've wanted to do for two centuries...return to the location of my body where I can finally rest in peace.
Not waiting for a reply Vlastoes raises his voice someone excitedly. We can do this if you can go out and return to me specific items to which I can assemble into an artifact that can transfer us back. I know the location of each item, but lack a way to transport to the location of the items...until now.
The wizard turns now to the witch and points to her finger which now is equipped with a strange ring. You young one have an item that can get us what we need. The pieces are now all in place. Will you help me get the items I need. If so, I can tell you one other special piece of information about that ring that I know. What say you...