Coven Horror

Wails of the Unborn. Humanoids within 60 ft. of the horror that can hear it have disadvantage on Consitution saving throws to maintain concentration. 

Magic Resistance. The horror has advantage on saving throws against spells and other magical effects. 

Multiattack. The horror can use its gaze. It then makes two claw attacks. 

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage. 

Gaze. The horror gazes at a random target it can see within 60 ft. 
1. Gaze of Agony. The target creature must make a DC 15 Charisma saving throw, taking 36 (8d8) psychic damage on a failed, or half as much on a successful one. 
2. Gaze of Lethargy. The target creature must make a DC 15 Charisma saving throw. On a failed save, the target can't use reactions its speed is halved, and it can't make more than one attack on its turn. In addition, the target can either take an action or a bonus action on its turn, but not both. These effects last for 1 minute. The creature can repeat the saving throw at the end of its turn, ending the effect on a successful saving throw. 
3. Gaze of Despair. The target creature must make a DC 15 Charisma saving throw. On a failed save, the target becomes overwhelmed with despair for 1 minute, and his disadvantage on attack rolls, saving throws and ability checks. The creature can repeat the saving throw at the end of its turn, ending the effect on a successful saving throw.