Arcane Charge

You charge yourself with magical energy and unleash a bolt of arcane power at a target. Make a ranged spell attack against a creature in range. On a hit, the spell does 3d8 force damage.

You can charge the spell as a bonus action before casting it, increasing its power. When you charge the spell, you must spend an extra slot of 2nd or higher. If you do, the spell's damage increases by 1d8 for every level of slot spent beyond 1st. For example, charging the spell with a 3rd slot does 4d8 force damage instead of 3d8.

While concentrating on the spell,  you can use your action on later turns to make extra attacks with the spell. Each attack does the same damage as the initial attack, but you can choose a different target for each attack.