Blighted One

Blighted Aura. When a creature within 10 feet of the Blighted One makes an attack roll, ability check, or saving throw, the creature rolls 1d4 and subtracts the number rolled from the attack roll, ability check, or saving throw. A creature can be affected by only one Blighted Aura at a time, and the effect doesn’t stack with bane.

The Blight. A creature that takes necrotic damage from the Blighted One must make a DC17 constitution save or be affected with the Blight disease. At the start of each of its turns, the creature takes 9 (2d8) necrotic damage. The creature can repeat the saving throw at the end of each of its turns.

Spellcasting. The [monster name] is a 12th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The Blighted One has following spells prepared:

Cantrips (at will): chill touch, infestation, ray of frost, toll the dead

1st level (4 slots): inflict wounds, ray of sickness

2nd level (3 slots): blindness/deafness, hold person, ray of enfeeblement

3rd level (3 slots): bestow curse, stinking cloud

4th level (3 slots): blight, grasping vine

5th level (2 slots): cloudkill, insect plague

6th level (1 slots): disintegrate, harm

Blight touch. Melee Weapon Attack: +9 to hit, reach 5 ft., single target. Hit: 41 (6d10 + 5) necrotic damage.