Room Effects

Permanent Effects

evil rooms = undead deal double damage
many fights rooms = more item destruction, x3 
ancient = aging attacks are doubled
tingling room effect is something * 0.3
malevolent presence = double piety cost?
benevolent presence = reduced piety cost? (4x?)
bloody = more bleeding
charged = reduced magic cost?
devoid of life = no hp regen
chilling silence = damage * 10
vibrate with life = perhaps reduced damage?

One-shot Effects

 ----- 1 -----
 Message:     You hear an eerie wail for a few seconds...
 Condition:   PC isn't deaf
 Effect:      none
 ----- 2 -----
 Message:     You notice a pale fading ball of light upon entering this
              room.
              (more)
              It quickly disappears.
 Condition:   PC can see the tile he's standing on (ie he's not blind
              and it's not dark)
 Effect:      none
 ----- 3 -----
 Message:     A rat scurries between your feet and disappears in a
              small hole in the ground.
 Condition:   PC can see the tile he's standing on
 Effect:      none
 ----- 4 -----
 Message:     The breeze accompanying you causes some ancient bones on
              the floor to transform into dust.
              (more)
              You feel a sense of relief.
 Condition:   PC can see the tile he's standing on
 Effect:      Heals 1 (one) HP
 ----- 5 -----
 Message:     Upon entering this room you feel a strange magical shock!
 Condition:   PP is not 0
 Effect:      Sets PP to 0
 ----- 6 -----
 Message:     This room seems to be particularly unholy!
 Condition:   Player has temporary blessing
 Effect:      Temporary blessing is removed
 ----- 7 -----
 Message:     You hear a strange "*TCHUNK*" in your vicinity.
 Condition:   PC isn't deaf
 Effect:      none
 ----- 8 -----
 Message:     For a few seconds you see a looming shade before you. It
              points its hand towards you in a threatening manner!
              Then it disappears.
 Condition:   PC can see the tile he's standing on
 Effect:      none
 ----- 9 -----
 Message:     A mouth appears on the wall and says: "[random fortune]".
 Condition:   PC isn't deaf
 - otherwise: -
 Message:     For a moment a mouth appears on the wall and seems to
              say something!
 Condition:   PC is deaf
 Effect:      none
 ----- 10 -----
 Message:     The walls have mirrors with many distortions of your
              image.
 - then: -
 Condition:   Appearance > 18
 Message:     You look great in all of them.
 Effect:      +1 Charisma
 - otherwise: -
 Condition:   Appearance <= 18
 Message:     You can't stand the sight of your warped self.
 Effect:      -1 Perception
 - then: -
 Message:     All the mirrors shatter!
 Effect:      1d4 damage, death reason: "was killed by shattering
              mirrors"
 ----- 11 -----
 Message:     Images of books and comfortable chairs line the walls.
              (more)
              Suddenly the images fade away!
 Condition:   PC is not blind (effect can happen in the dark)
 Effect:      -1 Strength, +1 Learning
 ----- 12 -----
 Message:     This room looks like a spa with a mud bath. You are
              hit in the face by a glob of hot mud!
              (more)
              Suddenly everything disappears!
 Condition:   PC is not blind (effect can happen in the dark)
 Effect:      Extracted from GB:
              "Blinds the PC, lowers appearance by 1. Wipe the PC's
              (F)ace, to raise the PC's appearance by 2 for a net
              gain of 1."
              I've verified this and couldn't have put it better
              myself.
 
 That's it. One note, though: if the effect's condition isn't
 satisfied, no message is shown, but a "(more)" prompt appears. This is
 the explanation of getting "(more)" prompts when entering dark rooms.