School enchantment (compulsion) [mind-affecting]; Level cleric 8, sorcerer/wizard 8
Components V, S, M (mercury and phosphorus, plus powdered diamond and opal worth a total of 5,000 gp)
Saving ThrowWill negates
This spell functions like symbol of death, except that all creatures within the radius of the symbol of insanityinstead become permanently insane (as the insanity spell).
Unlike symbol of death, symbol of insanity has no hit point limit; once triggered, a symbol of insanitysimply remains active for 10 minutes per caster level.
Note: Magic traps such as symbol of insanityare 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 insanity.