Crimson Bolt.

A condensed bolt of blood shoots toward a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 2d8 piercing damage. Upon usage, the caster takes half the total as self damage.

At higher levels, the damage die changes to 3d8 at level 5, 4d8 at level 10, 5d8 at Level 14, and 6d8 at level 17.