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The Prisms of Worlds are large hollow, crystalline structures. They are shaped like octagons with each side fashioned of a different colored glass. Inside of them is an octagon shaped chunk of the Ebon Bedrock. Some of the Syndics of the Council of Nine created these magical devices to serve as gateways to other worlds.
A Syndic named The Tome, was the brains behind this invention. There are three prisms, each a link between Bal-Kriav and the mortal world Oerth. One Prism is in Paradomea City. By entering this prism, a traveler is taken to Oerth. On this world, those entering that prism are taken to Black Forge's royal courtyard turned graveyard. It is a haven for ghouls, ghasts, and other lesser undead. The location of the third prism is unknown.
When the Prisms of Worlds were created, they used so much magic that they weakened the Web of Magic. This caused Black Forge Keep and some of the area around it to be enveloped in a magical anomaly called an intra-system shift. This moved the keep from the world Oerth to the world Bal-Kriav.
Fellow Syndics, a group of adventurers has come through the Great Prism of Black Forge. They call themselves the League of Ten. They were shocked by the decadence of our great city. It seems that the world they came from is much more peaceful, less developed, ripe for exploitation.
- Mefnimius, Information Officer to the Council of Nine, on the arrival of the League of Ten from Oerth - "Reports to the Dark Merchants"