The Scellé Dimensionnel is a minor artifact that seals off a planar Zone De Manifestation. Les Gardiens used Scellé Dimensionnels to sever the various Zone De Manifestations to Xoriat at the end of the Guerre Daelkyr.
The origins of the magics of creating Scellé Dimensionnels has been Perdu to time, though it is assumed that the knowledge originated with the Dragon Vvaraak, the mentor of the first Gatekeeper druids. The Gobelins of the Empire Dhakaani tried to duplicate their magics, and an artificer named Taruuzh came close with his binding stones, but even he could not duplicate the Scellé Dimensionnel.
Towards the end of the Guerre Daelkyr, the Gardiens began placing these seals throughout the Frontières de l'Ombre and Confins d'Eldeen after combined Orc and Gobelin forces pushed the daelkyr armies back to the plane of Xoriat. The seals severed ties with the Realm of Madness, preventing the daelkyr from returning to Eberron.
Since the Scellé Dimensionnels were created nine thousand years ago, though, their magics have been slowly deteriorating. The Gatekeeper druids have been tasked with maintaining their magics; but the Gardiens' numbers grow smaller and smaller each year. Now, an estimated thousand Gardiens are spread across the Confins d'Eldeen and the Frontières de l'Ombre. While the Gardiens have the ability to temporarily generate the effects of a Scellé Dimensionnel, they do not have the abilities to recreate the artifacts.
A Scellé Dimensionnel is a massive stone slab covered in an intricate pattern of runes and sigils.
The seal has two major effects. The first is that it projects an aura with a radius of two miles. This aura prevents effects such as teleportation, planar shifting, summoning, or dimensional travel. The second is that it contains the effects of a Zone De Manifestation, negating its influence upon Le Plan Matériel.
In addition, the placement of these seals disturbed Xoriat's orbit in Le Plan Astral, preventing it from becoming Limitrophe with Eberron.