Dreadball

 A dark ray of flame extends from the casters hand against a creature they can see in range, The caster makes a ranged spell attack, on hit a black fireball erupts around them, centered around their head if they have one, causing 8d8 cold damage

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 cold damage for each slot level above 4th