Arcane Artillerist (5e Feat)
From D&D Wiki
Prerequisites: Ability to cast spells
You have trained in the art of war in it's deadliest form, the power to destroy armies through the might of the arcane.
When you cast a spell with a spell slot larger than necessary (i.e. casting firebolt with a 7th level spell slot), the spell is is modified in the following manner:
-If the spell has a range greater than self, the range is doubled.
-Your spells' area or reach is also doubled (15-foot cone becomes 30-cone, 20-foot radius becomes 40-foot radius, etc.)
You can do that three times after that you need to have a long rest to recover all the charges.