Elemental Vortex

Choose an element, acid, cold, fire, lightning, or thunder. For the duration of the spell a swirl of energy corresponding to that element surrounds you in a 10ft radius. When a creature enters the area on the first time on a turn or starts it's turn there. It must make a wisdom saving throw. On a failed save the creature takes 2d4 damage and on a successful save that damage is halved