Technician (5e Feat)
From D&D Wiki
Prerequisites: Must be able to cast at least one 1st, 2nd, or 3rd level spell
You have superior arcane knowledge of one of your lower level spells, and you aren't afraid to flaunt it.
- Choose one spell that is not a cantrip, is 3rd level or below, and lets you roll a die (e.g. magic missile). The die for that spell is increased by 1 size.
For example, for Ray of Sickness, which is normally 2d8, it would go to 2d10. For Magic Missile, which is normally 3 bolts of 1d4+1, it'd be 3 bolts of 1d6+1.