Asphyxiate (EFA - A)

Your magic causes living creatures to suffocate. Choose up to 6 creatures you can see within range. Those creatures begin to choke and have difficulty breathing. For the duration, they are affected as though under a Slow spell.

At the beginning of each of its turns, each affected creature must make a Constitution saving throw. Taking 3d8 necrotic damage on a failed save, and half as much damage on a successful one. After a creature makes 3 successful saves, the effect ends on it. After a creature makes 3 failed saves, it dies, having choked to death.