Bremen

Legendary Resistance.  (3/day)  If Bremen fails a saving throw, it can choose to succeed instead.

Woof ruff! Doodly-doo? Heehaw~!  While hostile creatures are effected by madness, all damage immunities are turned into resistances and damage resistances are converted to neutral towards Bremen.  When rolling for the madness table, DM is allowed to roll twice and decide which effect is used.  The effect lasts for 1d4 turns.

Erlöschend Dirge of a War Grave.  At the start of Bremen's turn, all hostile creatures must make a DC 14 WIS save or receive an effect from the short-term madness table.  At the start of each round after the first, the DC of the save increases by 3.  

Triarchy.  When Bremen would reach 125HP, they would stay at 125HP until the start of it's next turn.  Upon the start of it's next turn, gain the "Busted Chops" effect.

Busted Chops.  An effect applied to Bremen.  While having this effect, gain access to "Triarchy" attacks.  All damage rolls gain an additional damage die of the same type.  Once per attack made on hostile creatures, creature must make a DC 16 WIS save or take an effect from the short term madness table.

Beklemmt Resolve.  Whenever a creature on the field would receive an effect from the madness table, Bremen heals 1d12+6 HP.

From the Top.  At the start of each round, Bremen selects one creature to have the "Tagged" effect.

Tagged.  Whenever a creature with this effect would make an action, bonus action, reaction, or make a movement, they must make a DC 22 WIS save at disadvantage.  On a failure, apply an effect from the madness table.

Martial Song of the Battlefield.  Bremen makes all attack rolls at advantage.  Bremen has 3 reactions per turn.

Nuovo Fabric.  When receiving dmg, reduce the dmg by 1d8+8.

Shimmering.  Creature is unaffected by disadvantage.

Feeble.  An effect applied to creatures.  Creatures with this effect lose one dmg die when rolling for dmg.  For each X count, lower to hit rolls by X amount.

Bind.  A effect applied to creatures.  At the start of effected creature's turn, creatures goes down in initiative by X amount.

Disarm.  An effect applied to creatures.  At X count, creatures decreases AC by X amount.  

Multiattack. Bremen can make up to 3 attacks per round.

Barkruff! BARK~!!!. Melee Weapon Attack: +13 to hit, reach 5 ft., 1 target. Hit: 21 (2d10 + 10) [Slashing] damage.  On hit: Apply 2 Bind and 2 Disarm.

Cockadoodledoo~!!!!  Ranged Weapon Attack: +14 to hit, range 30/60 ft., 1 target. Hit: 17 (2d8 + 8) [Piercing] damage.  On use: Increase AC by 3 until the start of Bremen's next turn.

Neiiigh~!!!  Melee Weapon Attack: +13 to hit, reach 5 ft., 1 target. Hit: 30 (3d10 + 14) [Bludgeoning] damage.  On hit: Targeted creature must make a DC 15 CON save or have the Paralyzed condition until the end of their next turn.

Menacing Noise. (Triarchy)  Melee Weapon Attack: +16 to hit, reach 5 ft., 1 target. Hit: 17(2d8 + 8) [Bludgeoning] damage.  On hit: Apply 2 Bind and 1 Feeble.  

Fanciful Tune.(Triarchy)  Ranged Weapon Attack: +15 to hit, range 30/60 ft., 1 target. Hit: 17 (3d10 + 15) [Piercing] damage.  On hit: Apply 2 Feeble.  On use: Heal 2d6 + 3 HP.

Wohlklang. (Triarchy)  Ranged Weapon Attack: +17 to hit, range 30/180 ft., this attack hits all hostile creatures. Hit: 35 (6d8 + 8) [Bludgeoning] damage.  On hit: Creature has disadvantage on all D20 rolls until the end of their next turn.M

Rarf RARF RARF!!  Select one creature within 90ft.  This creature gains 2 Feeble.

BAWKBAWKBAWK!!!  Until the end of this turn, all damage rolls gain an additional damage die of the same type.

NEIIIGHHIHIHH!!!  Select one creature within 60ft.  This creature must succeed a DC 18 CHA save.  On a failure, creature has the Tagged effect.

Silvery Barbs. You know what this does vro.  

Concerto.  (Triarchy)  When hit, expend a reaction to do a Melee Weapon Attack: +14 to hit, 19 (2d10 + 8) [Bludgeoning] damage to creature who hit Bremen and move up to half their movement speed without provoking opportunity attack.

Music Therapy.  (Triarchy)  When hit, expend a reaction to do a Melee Weapon Attack: +13 to hit, 11 (1d12 + 5) [Bludgeoning] damage to creature who hit Bremen, reduce dmg taken by (1d10+5), and heal 2d12 + 7 HP.

Bremen can make 3 legendary actions, choosing from the options below. They regain spent legendary actions at the start of her turn.

Barking (Costs 1 Actions). Bremen can move equal to it's movement speed without provoking opportunity attack before making one Barkruff! BARK~!!!, Cockadoodledoo~!!!!, or Neiiigh~!!!  attack.

Clucking.  (Costs 1 Actions). Make one Rarf RARF RARF!!, BAWKBAWKBAWK!!!, or NEIIIGHHIHIHH!!! action.

Neigh... vro.  (Costs 2 Actions). Make one Menacing Noise. (Triarchy), Fanciful Tune.(Triarchy), or Wohlklang. (Triarchy) attack.

The Reverberation Ensemble. Bremen can make up to 2 Mythic Action per day.

French Horn, Tuba and Trombone (Costs 1 Actions). During Bremen's turn, up to 3 creature's must make a DC 22 CHA save.  On a failure, creature takes 2d20 Psychic dmg and takes an effect from the short term madness table.  On a success, take half dmg.