The Vial of Horrors is a magical object kept by Grippa in Blackwell Keep, and was lent to Seth Sorenson only as a last resort.

It can only work once, but when it is unstopped, every being present will see some of their worst fears come to pass, including the one who opened it. The effect is all an illusion but incredibly vivid, and only lasts a few minutes. But that might allow the user time to make an escape if they keep their wits.