The Embryonite (GEP)

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Classes of knowledge include the proven, the unproved, and the mythical, with finer distinctions in between. The Embryonite falls in the realm of the mythical, to say the least. See, the Embryonite is supposed to be a planet-sized insect that nourishes fledgling demiplanes in its thorax cavity, the protoworld visible as a celestial glimmering through its mother's translucent flesh... well, that has to be a myth.
Still, there're some cutters of otherwise trustworthy reputation who swear they've seen a critter that matches this description. It makes a body stop and think. If the Embryonite exists, from whence did it come? Is it alone, or is it part of a brood, making it merely one of several embryonites? What is its purpose, and what primeval thoughts move through its vast braincase? More importantly, what does it eat when it gets hungry-hopefully not other demiplanes!
A group of 12 etherfarers recently chartered an ethereal planecruiser, outfitting it for a journey of extended duration. Hark Longsilence (Pl/♂ human/F7, Ill 10/Etherfarer/CG) leads the group. Hark's goal? To prove the existence of the Embryonite, which his mother went to her grave believing in, and to discover the nature of the gestating demiplane within.