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The fourth layer holds no civilization. The items here are dangerous, deadly, and cursed. The monsters are truly horrifying and powerful - forgotten fragments of gods even the gods want to get rid of, aberrations from beyond the gate, displaced demon princes so vile even the hells and abyss wouldn't accept them. This place is strange, terrifying, and everything is dangerous.
The fifth layer is a vast void at the center of the planet, and it is filled with only strange aberrations from beyond. Here, the king of the layer rules from his castle of tesseracts. He is an abomination on the level of the lady of pain, strange and powerful. Thrust out of reality at the dawn of the multiverse, he is a being beyond comprehension, that even the gods would fear.
The reveal? He actually lives on the outer layer of the planet. Going "deeper" actually means going out closer to the infinite void, filled with strange aberrations unable to survive in the proper universe. You aren't going down - you're going out - and losing the protection of the layers of cursed items and dangerous banished creatures.
On the final level, there are gates. The laws of physics are strangest here, and only here, among the most dangerous things, can a way out be found. But beware, for you are not the only one that wishes to escape, and an open gate is like a guided beacon to the things that live in the void...