The Immeasurable Heaven: Caspar Geon

The Race for Reality Has Begun.
The galaxy of Yokkun’s Depth has been settled since time immemorial. There is only one frontier left, and it’s a one-way journey: to pierce the skin of existence and delve the countless younger universes beneath.
Running through these universes is the fabled Well, a fissure formed in the distant past into which horrors have been flung for millions of years. Amongst their number was an impossibly ancient sorcerer, cast down to the wastelands of a thousand apocalyptic worlds, never to return.
Until now.
Whirazomar is crossing the stars in the belly of a sentient spore, hoping she can make it to the Well before her masters’ rivals realise what she’s hunting: somewhere far below them, a hapless explorer has drafted a map of reality. A map that the exile is sure to seek out. A map so valuable that a kaleidoscope of beings will run the gauntlet of every universe to get it, even at the cost of their lives.