Soul Cage

The Soul Cage is, when treated correctly, powerful enough 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, before Trent, the blacksmith of Skara Brae, could finish it, he died in the fire. It wasn't until the Avatar helped his spirit in Ultima VII to overcome his rage, that he was able to finish it (after getting an iron bar). Bathing the Cage in the Well of Souls, it gained powers and was used to trap the Liche.

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