The Energy Planes (TIP)

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Air, Earth, Fire, and Water are four of the major Inner Planes, but a body who wants to understand the whole picture can't ignore two other critical realms: the Energy Planes. As their name implies, they're composed not of matter, but of energy. Both places are difficult to define, but their effects are inescapable.
POSITIVE ENERGY. The plane of Positive Energy is said to be the mother of all life. That's because the radiation of this bright realm gives animation to all living things. Despite this service to the multiverse, however, Positive Energy is an empty void. Physical matter has no place here.
There are few bashers strong enough to survive in this plane. The natural life-giving properties of positive energy can quickly overwhelm any creature, destroying it utterly. Many graybeards speculate that creatures annihilated in this fashion are actually elevated to a new status of being, but there's no easy way to test that theory-at least, not safely.
NEGATIVE ENERGY. The plane of Negative Energy is an ever-hungering maw that seeks to quench the fires of life wherever they bum. It gives power to the ranks of the undead and other such mockeries of life, but the place is anathema to all normal creatures.
Survival in the Negative Energy Plane is difficult indeed. A visitor must deal with the complete absence of matter, including air, as well as the plane's natural lifedraining properties.