Bernard T. Dinoswole III Esq.

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

Spellcasting. Bernard is an 18th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). Bernard can cast suggestion and confusion at will and has the following spells prepared:

Cantrips (at will): fire bolt, friends, mage hand, mind sliver, shocking grasp

1st level (4 slots): hideous laughter, dissonant whispers, charm person, silvery barbs

2nd level (3 slots): crown of madness, hold person, zone of truth

3rd level (3 slots): fast friends, fireball, incite greed

4th level (3 slots): charm monster, raulothim's psychic lance, compulsion

5th level (3 slots): geas, modify memory, synaptic static

6th level (1 slot): otto's irresistible dance

7th level (1 slot): power word pain

8th level (1 slot): power word stun

9th level (1 slot): psychic scream

Multiattack. Bernard makes two attacks: one with its bite and one with its hug.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 33 (4d12 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and Bernard can't bite another target.

Hug. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 33 (4d12 + 7) force damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and Bernard can't hug another target.

Sing: Bernard can sing an incredibly inane song that can charm its listener.  Every humanoid, giant, or goblinoid within 300 feet of Bernard that can hear the song must succeed on a DC 11 Wisdom saving throw or be charmed until the song ends. Bernard must take a bonus action on its subsequent turns to continue singing. It can stop singing at any time. The song ends if Bernard is incapacitated.

While charmed by Bernard, a target is incapacitated.  If the charmed target is more than 5 feet away from Bernard, the target must move on its turn toward Bernard by the most direct route, trying to get within 5 feet. It doesn't avoid opportunity attacks, but before moving into damaging terrain, such as lava or a pit, and whenever it takes damage from another source, the target can repeat the saving throw. A charmed target can also repeat the saving throw at the end of each of its turns. If the saving throw is successful, the effect ends on it.

A target that successfully saves is immune to Bernard's song for the next 24 hours.

Aura of Dumb-ination. Bernard emits an aura of intolerable idiocy. Any individual within 30 feet must succeed on a WIS 15 save, or lose 1 point of Wisdom per round. When Wisdom reaches zero, the victim falls to the ground in a quivering, gibbering wreck. 

Wisdom may be regained at the rate of 1 point per short rest afterwards. In addition, the aura tends to make spells go awry, tactics to fail, so all attacks within 30 feet are made with Disadvantage.

Additionally, some mundane items within Bernard's aura may become intelligent with their own insipid personalities.