Electricity Blast Rune

As a standard action, you can create a blast rune in a desired location. Any creature entering a 5-foot area around the rune takes 1d6 points of electricity damage + 1 point for every two levels you possess in the class that gave you access to this domain. The rune lasts a number of rounds equal to your level in the class that gave you access to this domain. You can use this ability a number of times per day equal to 3 + your Wisdom modifier.