Dimensional Seal

From Eberron: Rising From the Last War, page 280; and Wayfinder's Guide to Eberron, page 118.

Description
Eldritch machine, legendary.

A dimensional seal is a massive stone slab covered with a complex pattern of runes and sigils. The seal projects an invisible field in a 2-mile radius. This field blocks all forms of conjuration magic and any other effect that involves teleportation or planar travel. Dimensional seals are usually found in the Eldeen Reaches and the Shadow Marches-reminders of the conflict between the Gatekeepers and the daelkyr. The techniques used to create these seals have been long lost. It's said that as a whole, the dimensional seals keep the daelkyr bound in Khyber and prevent Xoriat from becoming coterminous with Eberron. If enough of these seals are destroyed, there could be dire consequences for the world.