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Symbol of Revelation
This spell allows you to scribe a potent rune of power upon a surface. When triggered, a symbol of revelation kills one or more creatures within 60 feet of the symbol (treat as a burst) whose combined total current hit points do not exceed 150. The symbol of revelation is only activated by invisible creatures, creatures affected by an illusion (glamer) effect, creatures with the shapechanger subtype, or creatures that have magically changed their shape. These creatures are outlined by a pale light that functions like faerie fire, except it lasts for 10 minutes per caster level; the symbol does not otherwise reveal their true form. Once triggered, a symbol of revelation remains active for 10 minutes per caster level.
The symbol of revelation affects the closest creatures first, skipping creatures with too many hit points to affect. Once triggered, the symbol becomes active and glows, lasting for 10 minutes per caster level or until it has affected 150 hit points' worth of creatures, whichever comes first. A creature that enters the area while the symbol of revelation is active is subject to its effect, whether or not that creature was in the area when it was triggered. A creature need save against the symbol only once as long as it remains within the area, though if it leaves the area and returns while the symbol is still active, it must save again.
Until it is triggered, the symbol of revelation is inactive (though visible and legible at a distance of 60 feet). To be effective, a symbol of revelation must always be placed in plain sight and in a prominent location. Covering or hiding the rune renders the symbol of revelation ineffective, unless a creature removes the covering, in which case the symbol of revelation works normally.
As a default, a symbol of revelation is triggered whenever a creature does one or more of the following, as you select: looks at the rune; reads the rune; touches the rune; passes over the rune; or passes through a portal bearing the rune. Regardless of the trigger method or methods chosen, a creature more than 60 feet from a symbol of revelation can't trigger it (even if it meets one or more of the triggering conditions, such as reading the rune). Once the spell is cast, a symbol of revelation's triggering conditions cannot be changed.
In this case, “reading” the rune means any attempt to study it, identify it, or fathom its meaning. Throwing a cover over a symbol of revelation to render it inoperative triggers it if the symbol reacts to touch. You can't use a symbol of revelation offensively; for instance, a touch-triggered symbol of revelation remains untriggered if an item bearing the symbol of revelation is used to touch a creature. Likewise, a symbol of revelation cannot be placed on a weapon and set to activate when the weapon strikes a foe.
You can also set special triggering limitations of your own. These can be as simple or elaborate as you desire. Special conditions for triggering a symbol of revelation can be based on a creature's name, identity, or alignment, but otherwise must be based on observable actions or qualities. Intangibles such as level, class, HD, and hit points don't qualify.
When scribing a symbol of revelation, you can specify a password or phrase that prevents a creature using it from triggering the symbol's effect. Anyone using the password remains immune to that particular rune's effects so long as the creature remains within 60 feet of the rune. If the creature leaves the radius and returns later, it must use the password again.
You also can attune any number of creatures to the symbol of revelation, but doing this can extend the casting time. Attuning one or two creatures takes negligible time, and attuning a small group (as many as 10 creatures) extends the casting time to 1 hour. Attuning a large group (as many as 25 creatures) takes 24 hours. Attuning larger groups takes an additional 24 hours per 25 creatures. Any creature attuned to a symbol of revelation cannot trigger it and is immune to its effects, even if within its radius when it is triggered. You are automatically considered attuned to your own symbols of revelation, and thus always ignore the effects and cannot inadvertently trigger them.
Read magic allows you to identify a symbol with a Spellcraft check (DC 10 + the symbol's spell level). Of course, if the symbol is set to be triggered by reading it, this will trigger the symbol.
A symbol of revelation can be removed by a successful dispel magic targeted solely on the rune. An erase spell has no effect on a symbol of revelation. Destruction of the surface where a symbol of revelation is inscribed destroys the symbol but also triggers it.
Symbol of revelation can be made permanent with a permanency spell by a caster of 12th level or higher for the cost of 10,000 gp. A permanent symbol of revelation that is disabled or has affected its maximum number of hit points becomes inactive for 10 minutes, but then can be triggered again as normal.
Note: Magic traps such as symbol of revelation are hard to detect and disable. While any character can use Perception to find a symbol, only a character with the trapfinding class feature can use Disable Device to disarm it. The DC in each case is 25 + spell level, or 33 for symbol of revelation.