Agglutination

You create a magical orb in your hand and blood clumps around it. You can use your action to hurl the orb at a creature, making a ranged spell attack against a target of your choice within range. If you hurl the orb, it returns to your hand at the end of your turn. On a hit, the attack deals 1d6 blood damage and the orb grows bigger if the target has blood. Each time the orb hits a creature with blood, it keeps growing, and its damage increases by 1d6.
The orb disappears when the spell ends.
At Higher Levels. This spell’s damage increases by
1d6 when you reach 5th level (2d6), 11th level (3d6),
and 17th level (4d6).