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Brainstorm: Krohnus the Crater Planet

There exists a world, ravaged by constant bombardment of radiation such that the surface has become a living hell.  No vegtation seems to survive there; life is barren, hot, unkind in every way.  However, deep in the depths of the planet's layers lay a crater, many miles deep and many miles wide.  The radiation passes over the crater, leaving the inside untouched by death.  Within this crater, all normal life on the planet survives.  Outside of this crater, well, the things that live there are things like outsiders, demons, devils, and other toughened species.

The crater itself is divided into large oval bands of layers, each band miles wide and supporting a specific ecosystem.  Various humanoid races are scattered through the vegetated layers in cities, tribes, and villages.  All the diversity of what once was perhaps a living, flourishing planet, now exists in these layers of the crater.

Deep within the crater is a radiation zone around the original meteor that created the crater.  It, like the planet, is called Krohnus.  Within its reach, only exotic, demented, and unnatural life spawns.

Under the crater, caverns delve far into the planet.  There, so rumors have told, entire cities dwell, living off the hidden life-giving water seas and lakes that still remain.  Few know of the undercrater life in the world above.
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