A small bolt of lightning bursts from your fingertips. (Roll a ranged spell attack) If the attack succeeds then the target and up to two creatures within five feet of the target take 1d6 thunder damage. 

   When scoring a critical hit with this spell all creatures hit must succeed a DC 17 constitution saving throw or be paralyzed until the end of their next turn.

   At 5th level the damage increases to 1d10.

   At 10th level the number of extra targets increases to up to six

   At 15th level the damage increases to 3d10