B.H.S.R

You create a floating black hole completely surrounded by mirrors in your hand and cast a small beam of light into it. This spell is instantly dispelled if the black hole leaves your hand or after 5 rounds of combat or you can choose to dispel it as a free action or as a reaction. When you choose to dispel this spell every creature in a 5ft by 100ft line in front of you must make a DC 25 Dex save, on a failed save the creature takes 1d8 (doubled for every round since the spell was cast) radiant damage and half as much on a success. For example, if this spell is dispelled 5 rounds after it is cast it will deal 32d8 damage. However, if this spell dispelled against your will (failed concentration check, duration ends, or the black hole leaves your hand) you and every creature in a 50ft radius sphere around you must make a DC 25 Dex save, dealing the same amount of damage as if you intentionally dispelled this spell.