Blood Corrosion

3rd-level necromancy (hemomancy)
Casting Time: 1 action
Range: 90 feet
Components: V, S
Duration: Instantaneous

You corrode the blood of creatures in a 20-foot-radius sphere centered on a point of your choice within range. Each target must make a Constitution saving throw. On a a failed save, a creature takes 4d8 necrotic damage and is poisoned for 1 minute. On a successful save, a creature takes half as much damage and is not poisoned. A creature poisoned by this spell must make a Constitution saving throw at the end of each of its turns. On a successful save, it is no longer poisoned by this spell.
Amplify 3. While poisoned by this spell, the creature also has anti heal equal to the necrotic damage it took.
At Higher Levels. When you cast this spell with a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.