will o' wisp

make's the enemy's magic self-destruct as he casts his spell but the higher you role the more strain on you body

(cuts your movement by 5 each time you roll higher than a 4 on 2d6 dice)if you use this spell more more than 5 time a fight you will have to roll a con saving throw(you have to beat a DC of 12) to see if you take damage 

level 2 casting is 3d6

level 3 cast you can choose what you roll or the DM can choose