Apathy demon

Apathy aura. Each non-demon creature that starts its turn within 30ft of the Apathy demon sufferers a -1 penalty to its attack rolls, skill checks, and saving throws. The penalty created by this aura does not end until the creature finishes a long rest outside of the aura for the duration of the rest. 

Amplify aura. If a creature remains in the aura for a round of combat it must make a DC 15 Wisdom saving throw at the start of its turn, or receive an additional -1 penalty to its rolls effected by the aura. This penalty accumulates every time the creature fails the save.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 16 (2d12 + 2) slashing damage. 

Leathagy sting. The Apathy targets a creature within 60ft. The creature must make a DC 15 Constitution saving throw, or take 8 (1d10 + 2) necrotic damage and fall prone.

Crippling cry (recharge 5-6). The Apathy lets out a cry affecting all creatures within 60ft that can hear the cry. The affected creatures must make a  DC 13 Constitution saving throw, a creature's speed is reduced by 5ft for each point under the save DC they roll. The save DC increase for each additional Apathy demon in the Apathy aura, all Apathy cry at once when this happens.