Disclaimer: I do not own Supernatural. For this story, I own only one major original character, Sefira, and four minor original angels.
Interdimensional Rift
Racing deeper and deeper within an abysmal realm was a beautiful, horizontal double helix, composed of a dark cloud and a divine light. This time, it was the Darkness that was being pulled by God towards the core of the Bottomless Pit.
"You're pulling me unnecessarily, Brother," complained the more feminine of the two entities, the dark cloud.
"That beloved dark cloud of yours appears to be summoning the trapped original Leviathan combiner with masculine characteristics," suggested the more masculine of the two entities, the divine light, "How appropriate, though, for her to choose this inescapable handiwork of yours as her place for summoning!"
Designed by the Destroyer herself, the Bottomless Pit's pull upon its monstrous inhabitants was designed to be immense, such that no physical light could escape. Nonetheless, they would always see all of Creation in one small patch of their view, including everything behind the core of the abysmal realm itself.
Deep within, the inhabitants would always be subject to spaghettification, yet would never be torn apart or tortured by it. Also, they would always be subject to the supernatural equivalent of black hole rain, yet they would never be fried or tormented by this otherwise deadliest form of light.
The realm could not be anything less than supermassive, or else the immediately surrounding primordial basis of dark matter could not accumulate around it through darkly yet beautiful motions. If created beings were to observe and feel this realm from a safe distance, they would see the supernatural equivalent of a supermassive black hole in all its beauty, yet feel the darkly pull of the supernatural equivalent of a stellar black hole.
"Do remind me again why you think my daughter formed the interdimensional rift we're investigating," enjoined the Darkness.
"Even if the now-adventurous Michael had just sired an immensely powerful hybrid with a human woman," answered God, "such a hypothetical being would still not be powerful enough to cause that rift to form. Even with power comparable to my two eldest sons put together, the primordial combiner that is being summoned is also not powerful enough to cause the rift to form, let alone one between its prison and this handiwork of yours from the plentiful primordial basis of dark matter."
Author's Note: An "arch-Naphil" more powerful than Lucifer's son Jack (from the official Season 12 finale) could still not be the culprit behind a rift more powerful than the multidimensional one seen in the official Season 12 finale.