Bubba Yago

Shapechanger. Bubba Yago can use an action to polymorph into a swarm of insects (mosquitos), or back into his true form. While in swarm form, he has a walking speed of 5 feet and a flying speed of 30 feet. Anything he is wearing transforms with him, but nothing he is carrying does.

Blessing of Mother Night. Bubba Yago is shielded against divination magic, as though protected by a nondetection spell.

Spellcasting. Buba Yago is a 20th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 20, +12  to hit with spell attacks). Bubba Yago has the following spells prepared:

Cantrips (at will): Acidic Splash, Chill Touch, Control Flames, Create Bonfire, Dancing Lights, Fire Bolt, Friends, Green Flame Blade, Gust, Infestation, Light, Lightning Lure, Mage Hand, Mage Stone, Mending, Message, Mold Earth, Poison Spray, Prestidigitation, Produce Flame, Sacred Flame, Thaumaturgy, Thorn Whip, Toll the Dead, Vicious Mockery

1st level (at will): Absorb Elements, Animal Friendship, Beast Bond, Burning Hands, Catapult, Cause Fear, Ceremony, Charm Person, Command, Compelled Duel, Comprehend Language, Create or Destroy Water, Detect (Evil, Good, Magic, Poison, Disease), Distort Value, Earth Tremor, Entangle, Faerie Fire, False Life, Feather Fall, Fog Cloud, Goodberry, Grease, Hex, Hideous Laughter, Identify, Magic Missile, Purify Food and Drink, Sanctuary, Shield, Sleep, Tasha's Hideous Laughter, Tasha's Caustic Brew, Unseen Servant, Witch Bolt

2nd level (8 slots): Aganazzar's Scorcher, Air Bubble, Animal Messenger, Arcane Lock, Augury, Barkskin, Beast Sense, Blindness/Deafness, Borrowed Knowledge, Calm Emotions, Cloud of Daggers, Continual Flame, Crown of Madness, Darkness, Darkvision, Detect Thoughts, Dragon's Breath, Enlarge/Reduce, Enthrall, Flame Blade, Flaming Sphere, Flock of Familiars, Gift of Gab, Gust of Wind, Heat Metal, Hold Person, Knock, Lesser Restoration, Locate (Animal, Plant, Object), Misty Step, Moonbeam, Nathair's Mischief, Pass Without a Trace, Pyrotechnics, See Invisibility, Shadow Blade, Silence, Suggestion, Summon Beast, Vortex Warp, Web, Wither and Bloom, Zone of Truth

3rd level (7 slots): Ashardalon's Stride, Bestow Curse, Catnap, Conjure Animals, Counterspell, Create Food and Water, Daylight, Dispel Magic, Elemental Weapon, Enemies Abound, Fast Friends, Fear, Fireball, Flame Arrows, Galdur's Tower, Gaseous Form, Haste, Incite Greed, Intellect Fortress, Life Transference, Magic Circle, Mass Healing Word, Melf's Minute Meteors, Motivational Speech, Plant Growth, Protection from Energy, Remove Curse, Revivify, Sending, Slow, Speak with Plants, Spirit Guardians, Summon Fey, Summon Lesser Demon, Tongues, Wall of Water, Water Breathing, Water Walk, Wind Wall.

4th level (6 slots): Banishment, Charm Monster, Compulsion, Confusion, Conjure Minor Elemental, Conjure Woodland Beings, Control Water, Death Ward, Dominate Beast, Fabricate, Faithful Hound, Find Greater Steed, Freedom of Movement, Giant Insect, Grasping Vine, Greater Invisibility, Guardian of Nature, Leomund's Secret Chest, Mordenkainen's Private Sanctum, Polymorph, Private Sanctum, Secret Chest, Summon Elemental, Summon Greater Demon, Wall of Fire, Watery Sphere

5th level (5 slots): Awaken, Bigby's Hand, Cloudkill, Commune, Commune with Nature, Conjure Elemental, Contact Other Plane, Contagion, Control Winds, Creation, Dawn, Dispel Evil and Good, Dominate Person, Dream, Flame Strike, Geas, Greater Restoration, Hold Monster, Immolation, Insect Plague, Legend Lore, Maelstrom, Mass Cure Wounds, Mislead, Modify Memory, Planar Binding, Reincarnate, Scrying, Summon Draconic Spirit, Teleportation Circle, Tree Stride, Wall of Force, Wrath of Nature

6th level (4 slots): Bones of the Earth, Create Homunculus, Disintegrate, Eyebite, Find the Path, Forbiddance, Globe of Invulnerability, Guards and Wards, Heal, Hero's Feast, Investiture of Flame, Investiture of Wind, Magic Jar, Mass Suggestion, Mental Prison, Otto's Irresistible Dance, Sound Cage, Summon Fiend, Sunbeam, Tasha's Otherworldly Guise, Tenser's Transformation, Transport Via Plants, True Seeing, Wall of Thorns, Wind Walk, Word of Recall

7th level (3 slots): Crown of Stars, Delayed Blast Fireball, Draconic Transformation, Dream of the Blue Veil, Etherealness, Firestorm, Forcecage, Planeshift, Power Word Pain, Regenerate, Resurrection, Reverse Gravity, Sequester, Simulacrum, Teleport, Whirlwind

8th level (2 slots): Abi-Dalzim’s Horrid Wilting, Animal Shapes, Anitmagic Field, Clone, Control Weather, Demiplane, Dominate Monster, Feeblemind, Glibness, Incendiary Cloud, Maddening Darkness, Maze, Power Word Stun, Sunburst, Tsunami

9th level (1 slot): Astral Projection, Blade of Disaster, Foresight, Gate,  Imprisonment, Invulnerability, Mass Heal, Mass Polymorph, Power Word Heal, Power Word Kill, Shapechange, Storm of Vengeance, Time Stop, True Polymorph, True Resurrection, Weird, Wish

Multiattack. Bubba Yago makes three attacks with his quarterstaff.

Quarterstaff. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) bludgeoning damage, or 10 (2d8 + 4) bludgeoning damage if wielded with two hands.

Summon Swarms of Insects (Recharges after a Short or Long Rest). Bubba Yago summons 1d4 swarms of insects (mosquitos). A summoned swarm appears in an unoccupied space within 60 feet of Bubba Yago and acts as his ally. It remains until it dies or until Bubba Yago dismisses it as an action.