The Sigil Keys

The Sigil Keys were a set of artifacts which, when joined, gave the possessor control over every portal in the city of Sigil, allowing them effectively to affect the whole universe simultaneously.

History
The Sigil Keys came into being around the same time as the city itself. It was instantly agreed that the Keys would be too dangerous together, so they were scattered to the far corners of the universe, and guarded carefully. The exact number of existing keys is unknown, though some scholars put the number at 108. The key that bound the others together was known as the Keystone of Sigil, and was hidden on the world of Lastlock.

In 5200 A.C., the Tainted Reality began to collect the Sigil Keys, and by the time of his imprisonment in 5600 A.C., he had collected the entire set with the exception of the Keystone.

In 6600 A.C., Jackson Aberdeen stole the Keystone with the help of Bilabad Jingleheimer, the latter who took the Keystone in turn from him and brought it to the Heroes of Lastlock, who held on to it until they tried to use it to trap the Tainted Reality, who finished his set when the trap failed.

After the Tainted Reality's defeat in Sigil, Calax acquired the set and fused their power with his own, but was sent back to the dawn of time by Cabel, where he was in turn also defeated and completely destroyed. After his death, the Keys did not again take a physical manifestation, so what happened to their power is unknown. It is the hope of many that the Keys were permanently destroyed by this incident.