More than a door
Alan Miller
(Dragon #41)




Dungeon doors, as a general rule, are treated with indifference.
You either bash them down, bum them up, or spike them shut and
then forget about them. However, doors have great possibilities for
adding surprise and humor to your dungeon:
 

01-75	Ordinary door
76-95	Door has an ability from table below
96-00	Door has 2-5 (1d4+1) abilities from table below

Abiliity Table

1-9	Intelligent door (alignment: 1 = Lawful Good, 2 =Neutral, 3=Chaotic Evil, 4=Other [Chaotic Good, Lawful Evil, etc.]).
10-17	Door is Wizard-Locked.
18-22	There is a trap or trap-trigger on or behind the door.
23-26	Door is an illusion.
27-29	Door is actually a polymorphed monster which reverts to normal form when conditions are met (someone grabs doorknob, etc.).
30-31	As 27-29, but is a phantasmal force.
32-35	Upon hitting, touching, or opening door it turns into mud, sand, mire, dung, etc.
36-40	A siren goes off if doorknob is touched (attracting and/or warning monsters).
41-45	Doorknob casts fear spell if touched.
46-49	Doorknob falls off if touched.
50-54	Door is thiefproof.
55-59	Door contains treasure.
60-64	Door is twice as hard to bash open, unlock, etc.
65-68	Door falls off hinges when opened.
69-71	Door is rotten or poorly constructed; it splinters or falls apart when bashed.
72-74	Door has a knocker.
75-76	Trap door to pit under or behind door.
77-78	Door has multiple locks.
79-80	Door jamb on other side of door.
81-82	Open pit behind door.
83-84	There is a window set in the door: 30% chance that it gives a false image (no monsters, twice as many monsters, heap of treasure, etc.)
85-86	Stakes, caltrops, and/or set spears waiting on other side of door (1 in 6 they are poisoned).
87-88	Stakes set in door so it can’t be bashed open (10% chance that they are invisible).
89-90	After being bashed open, the door swings back fast.
91-92	Door swings open just before it is bashed.
93	Has doorbell.
94	Door is hinged on top.
95	Door explodes if bashed.
96	Save vs. spells or are paralyzed when touch door.
97	Instant-setting contact glue on surface of door.
98	Doorknob casts miscellaneous spell if touched.
99	Doorknob gives disease if touched.
00	Contact poison on doorknob.