The Body Luminous (GEP)

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More than a few explorers of the Deep have come upon the Body Luminous on its solitary track across the Ethereal Plane. While vision on the Ethereal is usually restricted, around the Body Luminous the fogs fall away so that its tremendous form is visible: a celestial body consisting of a solid ether nucleus surrounded by a nebulous, glowing aura of evaporating protomatter tens of miles in diameter! The Body Luminous is not stationary; rather, it tumbles slowly through the Deep, trailing a tail of vibrantly colorful vapor.
The Body Luminous hails from outside of known ethereal spaces. Those who've managed to penetrate its coma report that the protomatter nucleus is oddly resistant to probing, and that glimpses of oddly preserved forms, creatures, and even artifacts are briefly visible, like fossils, before the tumbling behemoth and the pressure of the coma push away observers. Old TwoFingers tells of an entire city of bizarre shape attached to the side of the ethereal comet, filled with frozen beings of an incomprehensible nature.
It's possible that the Body Luminous is merely a massive blob of protomatter imparted with a significant amount of velocity by some distant catastrophe. The interior remains condensed and concentrated, but the outer layers continually erode and evaporate. At some point in the distant future, the Body Luminous will be only a story.
A scholar by the name of Kipwil Liams thinks that the Body Luminous is the last remnant of a world that suffered its own personal armageddon. If true, the preserved forms (or cities) sometimes visible represent the only memory of the works and accomplishments of this vanished world, and possibly some of its treasures. Those interested in salvaging the Body Luminous are hard pressed to even find it, since it slowly moves across recognized parts of the Waveless Sea and will soon move on to new tracks of the Deep, never to return to known spaces again.