The ancient city.
What if the ancient builders found it easier to get diamonds and iron the farther down, so they build the ancient city, where miners would mine?
After the end and nether portals, what if the portal statue in the middle of thr city was to a new dimension, the skulk dimension? A great source of xp and to get enchantments quickly. Altho, a very tough dimension.
However, one day, skulk came from the portal to the ancient city, with maybe a shrieker. One ancient builder killed a mob near the portal in the skulk dimension?
In thr over world, the builders were stunned at this. Upon close look, a mob spawned. The warden, killing everyone and breaking the portal in the process. However, some ancient builders were minding and came home with a nasty surprise, waiting for them. And that's when the deep dark began to grow and expand.
Near the portal in base game is sand soil on fire. We know that heat and a hard substance is required for a portal.
Now, my theory does have its downfalls. For example, how can skulk go from one dimension to another without the portal or how he builders get reinforced deep slate?
I not sure. But this is something to think about. The conditions for a portal are right.
Share your thoughts with me.