Crimson Rain

When you cast this spell, your current hit points are reduced by an amount equal to the spell's level.

Until the spell ends, blood falls like rain in a 20-foot-tall cylinder with a 40-foot radius centered on a point you choose within range. The area is lightly obscured, and exposed flames in the area are doused.

When the area appears, each creature in it must make a Constitution saving throw. A creature takes 5d12 necrotic damage on a failed save, or half as much on a success. A creature must also make this saving throw when it enters the spell's area for the first time on a turn or starts it's turn there.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by  1d12 for each slot level above 5th.