On a successful DC 20 Wisdom (Perception) check, a charged stone trap is spotted. It triggers if any creature of small or larger size passes over it. When triggered, the stone sends an electrical blast upward, and all creatures within 10 feet of the triggering creature must make a DC 15 Constitution saving throw, taking 18 (4d8) lightning damage on a failed save or half as much on a successful one. On a successful DC 15 Intelligence (Archana) check combined with a DC 15 Dexterity check (can be two different characters in the party), the trap is disarmed. Otherwise, the blast alerts enemies in nearby areas.