Symbol of Vulnerability

This rune is activated by any creatures. Once triggered, a symbol of vulnerability remains active for 10 minutes per caster level and saps the defenses of all creatures within 30 feet. Affected creatures receive a –4 penalty to spell resistance and a –4 penalty on saving throws, their damage reduction (if any) is reduced by 10 (to a minimum of 0), and any energy resistances they have are suppressed. The effects last as long as the creature is within the area of effect, and for 1 round per caster level afterward.