Corrupted Wilden Destroyer

Fey Ancestry. The Corrupted Wilden Destroyer has advantage on saving throws against being charmed, and magic can't put it to sleep.

Destroyer of Sanity (3/day). Once per turn, the Corrupted Wilden Destroyer can choose to channel the power of the evil and deal a special strike against a creature it hit. The creature takes an extra 8 (2d8) necrotic damage. This doesn't work on constructs, creatures with intelligence 5 or less, or creatures affected by magic such as the Mind Blank spell

Savage Strike. Whenever the Wilden Destroyer deals a critical hit, it adds one additional weapon damage die and adds it to the hit.

Charge. If the Wilden Destroyer moves at least 15 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 15 Strength saving throw or be knocked prone.

Corrupted Strength (3/day). Once per turn, whenever the Corrupted Wilden Destroyer rolls damage for a melee weapon attack, it can reroll the damage die and use either total. 

Master's Hold. If Auntie Victoria Redcougher is within 30 feet of the Corrupted Wilden Destroyer, It is immune to being charmed.

Multiattack. The Wilden Destroyer makes two greataxe melee attacks

Greataxe. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 11 (1d12 + 5) slashing damage. 

Shortbow. Ranged Weapon Attack: +3 to hit, range 80/320 ft., one target. Hit: 3 (1d6) piercing damage.

Protect the Master. If Auntie Victoria Redcougher is within 5 feet when a melee attack hits her, the Corrupted Wilden Destroyer can use it's reaction to take the damage instead of Auntie Victoria Redcougher