The Elder Scrolls: Tamriel real

You inscribe a rune of electrical energy on a solid surface within range. The rune remains dormant until triggered. When a creature moves within 5 feet of the rune, it erupts in a surge of electricity. The creature must make a Dexterity saving throw. On a failed save, the creature takes 5d8 lightning damage, or half as much on a successful one. The rune lasts for up to 10 minutes or until triggered.