Multi-dimensional Stacking Technology, Ange had seen it inside the Temple of Rest, and only there.
The Undead Temple on the Resting Plains could also be driven by Undead Godhood, but it didn't use Multi-dimensional Stacking. Perhaps it wasn't necessary; after all, the plains were vast.
But underground was different. The Eye of Rest might just be a deep pit two thousand kilometers into the ground, and yet the height of this underground space reached two thousand kilometers. Without Dimensional Stacking, this underground space would have definitely pierced through the surface.
The underground space was over two thousand meters tall, but its length and width stretched out beyond sight, no one knew how many dimensions were stacked to make it as expansive as an underground world.