As you recover your senses from the mind-wrenching effect of the force behind whatever magic it was that the Danneen deity called Bili sent at you, it becomes plain that you have been sent to some "elsewhere." It doesn't seem to be the brazen floor of some hell, but it doesn't look very promising otherwise... This adventure is suitable for a party of six d20 adventurers of 8th or greater level. If the party is to be given a free hand in deciding the order in which the panes are accessed then a few of the characters should be of the 9th or 10th level. With just a little work on the GM's part characters of 11th-14th level could adventure here-simply increase the number of monsters encountered, add extra levels to the NPCs, or place horrific guardian creatures here and there as pickets for the areas already detailed.