On activation, a "Neat!" or "Nope" prompt will appear, similar to the one prompt that appears from activating Maxwell's Door.
Upon opening the chest, the player must battle a Shadow Maxwell that is equipped with his own Dark Sword and a special Telelocator Staff that is able to summon high-damage explosive meteors that can easily kill the player in one hit, should they go about unarmored. The shadow of each meteor shows where it is about to land, so it can be dodged.
Upon defeating waves of shadow Maxwells, the portal will reactivate, and interacting with it will bring the player back to their current world, with all items intact. If the player sticks around after beating the arena, they can activate the special shadow Phonograph that will spawn. It will play Morse code when turned on, that when translated, says "exordium". Entering the password to will redirect the player to .
- There is a broken bridge leading to a large island, unreachable without cheats. On this island are a few plants that can be typically found in Grassland biomes.
- An easy way to reach the island is to use a Telelocator Staff using c_give ("telestaff") on the console.
- The crafting quote for the Shadow Portal ("Oh, the places you'll see.") is a reference to Oh, the Places You'll Go!, a book by Dr. Seuss.