As a creature comes within 20 feet of you, you shoot of a bolt of electricity at the target.  If the target fails a Reflex saving throw, it takes electricity damage depending on the level of the spell you cast.  If it succeeds, it only takes half damage.

1st: 2d6 electricity damage  + your Intelligence modifier

2nd: 3d6 electricity damage  + your Intelligence modifier

3rd: 5d6 electricity damage  + your Intelligence modifier

4th: 7d6 electricity damage  + your Intelligence modifier

5th: 9d6 electricity damage  + your Intelligence modifier

6th: 11d6 electricity damage  + your Intelligence modifier

Casting this spell doesn’t provoke attacks of opportunity.