Arcane Sliver

A sliver of pure magic the size of a longsword appears in your hand as you slash at a target. Make a melee spell attack against the target. On a hit, the target takes 1d10 force damage.

The spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).