You scribe a potent rune of power in the air. When the symbol is activated by a target approaching, all nearby targets suffer wracking pain that imposes a -4 penalty on attack rolls, skill checks, and ability checks for a duration of 30 seconds plus 12 seconds per caster level. A successful Fortitude save negates this effect. A symbol will persist for about 5 minutes until triggered. Once triggered, a symbol's power begins to wane. A symbol will dissipate 20 seconds after first being triggered. Symbols are volatile when placed together.