The Negative Border, often called the Negative Energy Plane or the Plane of Death, was an Inner Plane in the Cosmic Wheel cosmology. Scholars believed that negative energy and its opposite Positive Border, combined with the four Elemental Realms, made up the fundamental cosmos. It was thought to be a space of infinite size, an airless and featureless void of life-stealing darkness.
There was no known method of traversal across the Energy planes; it was a continuous vacuum of energy not meant for mortals. True to its nickname, the Plane of Death would bring a swift end to the unprotected by filling them with negative energy until their cells withered and they joined the necrotic conflagration.