This is similar to the Death Mountain Descent glitch, but do it backwards, facing left. Now at the right side of the box, stand directly next to it. Stand as close to the wall as possible and face left. Now teleport to the light world, and try to move one pixel forward. You shouldn't teleport back if you did it correctly. Don't move, or you'll have to do it all over again. Now, teleport back to the light world, and go directly left until you stop at the guy or until you feel you are far enough away. Pull out your sword, charge up, and move slowly right until you hit the portal. If you teleported back, you went too fast, so do the whole thing over again. Then, if you made it, move left, and you should jump down into the void, but be standing. You are now inside an otherwise unaccessible pit. Unfortunately, you will have to restart to get out of it.
Submitted by: Thor