Tainted Grounds

You can make an area of land tainted, centered around yourself. It makes the grass wither, the sky dim, and the soil black. All enemied within this area have to make a CON saving throw. If it doesn't exceed 10 or reach, they take 2d6+4 necrotic damage, if it does they only take 1d6+4 damage. It can keep dealing this damage to all enemies within the area every turn the spellcaster takes, but if they get hurt at all or distracted the spell falls apart. While the spell is active, they can take no other actions without the spell failing.