Black Fog, Scourge of Lavender Town

Legendary Resistance (2 per day). If Black Fog fails a saving throw, it can choose to succeed it instead.

Spectral Attacks. Black Fog's attacks are considered magical for the purpose of overcoming resistances and immunities.

Self-Destruct. When Black Fog reaches 0 hit points, it uses Self-Destruct, causing itself to explode. Any creature within 40ft. of Black Fog must succeed a DC 17 Dexterity saving throw or take 10d6 fire damage or half as much on a succeeded save.

Hypnosis. Black Fog's eyes glow red and a single creature of Black Fog's choice that can see him within 60ft. must succeed a DC 18 Wisdom saving throw or be lulled to sleep for 1 minute. The sleeper will also awaken if shaken or damaged.

Dream Eater (Recharge 6). Black Fog chooses a single sleeping creature within 60ft. The creature must succeed a DC 18 Charisma saving throw or take 10d6 psychic damage and have their maximum hit points reduced by that amount as black energy seeps out of their limp body. If the creature's hit point maximum is reduced to 0, they die.

Psychic (Recharge 5-6). Black Fog's eyes glow purple and a single creature that he can see within 50ft. must succeed a contested athletics check against an arcana check from Black Fog or have their body compressed by Black Fog's powers, causing them to take 15d4 psychic damage.

Multiattack. Black Fog can attack 3 times with Night Shade.

Night Shade. RangedWeapon Attack: +11 to hit, range 100 ft., 1 target. Hit: 15 (2d8 + 6) necrotic damage.

Explosion (once per day). Black Fog suddenly explodes, causing any creature within 40ft. to have to succeed a DC 17 Dexterity saving throw or take 16d6 fire damage or half as much on a success. Black Fog also takes this damage, but automatically makes the saving throw.