Hyper-Reality
From Multiversal Omnipedia
Hyper-Reality is a higher-dimensional level of existence where everything is more intense than normal reality- colors are brighter, sounds are louder, beings are stronger. The Mercurials are native to Hyper-Reality.
Comments
The concept of Hyper-Reality first appeared in the Ravenloft supplement The Nightmare Lands, but only existed as an actual place after the Planescape adventure Doors to the Unknown.