Blood Dart

You can weave your blood into the air to create a crystallized dart that pierces the enemy. You take 1d4 necrotic damage upon casting this spell, and immediately after taking this damage you can force one creature you can see within range to make a Constitution saving throw. On a failed save, they take 1d12 necrotic damage, and the dart pierces them, infecting their blood and poisoning them until the end of your next turn. This spell's damage increases by 1d12 when you reach 5th level (2d12), 11th level (3d12), and 17th level (4d12).