Casting Time 30 minutes
Components V, S, M (mercury and phosphorous, plus powdered diamond and opal)
Effect 60-ft. area rune within 100-ft. of ritual node
Saving Throw none; Spell Resistance yes
When this ritual node is created, you scribe a powerful rune within 100-ft. of it. When you scribe the rune, you specify a trigger of any complexity that can affect creatures within 60-ft. of the rune. Until the rune is triggered, it is considered inactive. Once the rune is triggered, it lasts for [20/30/40/50/60] minutes and then disappears for the rest of the day. It resets the next day. Each day, you may change the rune's position and/or triggers.
This rune 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 [20/30/40/50/60] minutes; the rune does not otherwise reveal their true form.
Read magic allows you to identify a symbol with a Spellcraft check (DC 15). 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 sleep. Destruction of the surface where a symbol of death is inscribed destroys the symbol but also triggers it.