Special Rooms: A Generator

Special Rooms: A Generator

 I use a bunch of the tables from the AD&D DMG Appendix A: Random Dungeon Generation. Particularly, I use the table for stocking rooms - Table V. F.: Chamber or Room Contents. Setting aside issues I've had using this method, the table appears as follows:

The entry for a roll of 18 is "Special," which, as far as I can tell, has no elaboration in the DMG (of course I might just have missed it). In any case, a while ago I started working on a set of tables for generating "special" rooms, starting by ripping off the DMG's description of rooms with pools. My master table looks like this:

d20	Room Seed	Completed	Link
1	Pool, magical or otherwise	X
2	Portal to Another Plane	X	Section 2
3	Summoning Chamber
4	Channeling Room
5	Plant Life	X	Section 5
6	Impossible/Alien Architecture
7	Crypt
8	Illusion
9	Magical Item Creation Facilities
10	Mundane Dramatic Architecture
11	Entry to the Underdark
12	Teleportation Chamber
13	Riddle
14	Physical Puzzle
15	Ore Vein
16	Entry to Another Dungeon
17	Alchemic Laboratory	X	Section 17
18	Intact/Functional Library
19	Game Animal Grounds
20	Farm/Greenhouse

Each of these entries links to a sub-table detailing the variety of special room. I'll add more details here as the project continues.