Many eons ago, a race of sorcerers now known only as the Ancient Ones cast a great magical working that sundered the very world upon which they stood.
The surviving shards that were all that remained of the world were cast adrift into the astral void, where the Ancient Ones once again cast great magics; this time to create the luminaires, portals and other spells to enable life to survive and continue on the sundered shards; bringing air, light, warmth and water, and connecting the lesser surviving peoples.
The Ancient Ones, powerful as they were, used their very life essence to power their final creation. With the exception of the fallen shard of Amanita, that creation has managed to survive to this day.
Centuries ago, the shard Amanita toppled, its luminaire now only gives light and warmth to the underside of the shard, its surface since having fallen cold and dead; many seek to learn if this is a possible foretaste of the ultimate fate awaiting all of the shards, or if it was caused by an aberrant event.