Arafen's Illusory Immolation

You decieve the mind of a creature you can see into believing that it has been set aflame. On a failed Intelligence saving throw the targeted creature has disadvantage on all Dexterity checks for the duration and takes 1d4 psychic damage, and on each of your turns for the duration, you can use your action to do 1d4 psychic damage to the target automatically. The frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on a success. On a succesful save the spell has no effect.

The spells initial damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).