Whisper of Death

You utter a deathly word, imbued with the power of necrotic energy, which eats up life force to power it's effects. Choose any number of creatures you can see within range. Each creature that can hear you must make a Charisma saving throw. On a failed save, a creature suffers an effect based on its constitution score:

• 16 CON or less: deafened for 1 minute, and takes 6d6 necrotic damage.
• 17 CON or more: deafened and blinded for 10 minutes, and takes 12d6 necrotic damage
• 20 CON or more: blinded, deafenedfor 10 minutes, and takes 24d6 necrotic damage.
• 30 CON or more: Takes half their hit points in necrotic damage, rounded down. 

Regardless of its current hit points, an undead, a fiend, an aberration, or a ooze that fails its save is forced into a state of temporary death where it cannot move and is an object for 24 hours by any means short of a wish spell. If a creature of these types succeeds the saving throw, they reel from the sound; their movement speed is 0 on their next turn.