Also, they do not create dimensions in the overworld. Be warned, though, if you went to many dimensions down, you may arrive at a completely different location. Eventually, placing enough WWDs will warp the player back to the overworld. The Wooden Warp Door creates a pocket dimension like the IDD, but this pocket dim is closer to the overworld rather than farther away.
Each pocket created leads the player farther and farther from the light of the overworld. More IDDs can be placed within the original pocket dimension, creating more, and this can be continued indefinitely. Entering the door teleports the player to this strange world where the fabric of reality is laid bare, exposed and raw.
The Iron Dimensional Door, when placed, creates a pocket dimension contained within zero space.
