Darkness inside

Summon the darkness that plagues you and use it to attack other as it did you, Cause other creatures sight in bright go to dim and in dim go to darkness. Darkness Inside has total health equal to 1/2 of characters health plus dexterity modifier. Darkness Inside also has a damage modifier of 1d8 and an additional 1d6 every level and if your health is below 50%, plus strength modifier. You may only cast this spell after taking damage. Can only dispel after a long rest.