|Trigger: Mechanical: Pressure Plate||Effects: Never Miss|
|Save: Dexterity||Duration: Instant|
|Resets: Automatic||Bypass: None (Avoid)|
Description: Temptation that leads to misfortune is the best way to create entertaining misfortune.
Peepholes create interesting encounters. Players will be tempted to take advantage of the information that can be acquired through the peepholes.
You should let them! The majority of the time this is exactly how peepholes should work because the players having this information enhances play, the additional information empowers agency.
And as an added bonus, you can occasionally use traps to cause disastrous misfortune! What kind of misfortune can result from a peephole?
A mirror can be placed so that the victim sees his own eyes staring back. Stabbing at the eyes can cause blades to break the weapon (or the arm) or puncturing the mirror can release poison gas.
Needles or blades can spring forward, doing actual damage (not just hit point damage) directly to a victim's eyes. This can cause blindness, usually permanent. It is trivial to replace this with an acid, chemical, or fire spray.
Another weakness is how close the delver must get to the wall. Once against the wall to peer through the hole, blades striking out at his midsection can cause severe damage.
Do not forget the mythic quality of these. Peepholes can show other things besides the area next door (thought that is very useful). If they look through and see a burlesque show, the future, the past, or home, or perhaps even dungeon levels further down, mirrors reflecting rooms far away, or even find that they are gazing upon themselves, looking into a peephole, peepholes can be a trick in themselves.
Detection/Disarming: The key here is to make sure you describe the untrapped peepholes with the same type of flavor and atmosphere as the trapped ones. Perhaps their are red or black stains near the peephole. After all at some point a person was likely caught unawares while gazing at a show.
At that, naturalistic descriptions of whatever results from the trap should provide enough clues. Do not neglect this as a method of control or manipulation either. A smart monster would put a blinded wounded corpse near a safe peephole after it had been killed near the trapped one.