Soul Cage

The Soul Cage, when treated correctly, was used to trap a Liche.

The Soul Cage was invented by Mordra to trap the Liche in Horance, so that the Liche Potion could destroy him. However, Trent, the blacksmith of Skara Brae, died in a fire before he could finish it. His ghost continued the work in Ultima VII, until the Avatar helped him overcome his rage. When it was finished, it was bathed in the Well of Souls. It was then empowered to trap the Liche.

It was destroyed, after the potion took effect, dissolving into dust.