Corrupted Wilden Ancient

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

Fey Step (Recharge 5-6). As a bonus action, the Corrupted Ancient Wilden can teleport up to 30 feet to an unoccupied space it can see.

Spellcasting. The Corrupted Wilden Ancient is a 9th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 16, +8 to hit with spell attacks). The Corrupted Wilden Ancient has following Druid spells prepared: 
Cantrips (at will): Druidcraft, Thorn whip, Shillelagh
1st level (4 slots): Earth Tremor, Entangle, Longstrider, 
2nd level (3 slots): Barkskin, Spike Growth, Flaming Sphere, Moonbeam
3rd level (3 slots): Conjure Blight*, Erupting Earth, Wind Wall
4th level (3 slots): Guardian of Nature, Giant Insect
5th level (1 slots): Insect Plague

*Like Conjure animals but limited to plant creatures with the word "Blight" or "Corrupted" in its name

Corrupted Strength (3/day). Once per turn, whenever the Corrupted Wilden Ancient 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 Ancient, It is immune to being charmed.

Quarterstaff. Melee Weapon Attack: +3 to hit (+6 with Shillelagh), reach 5 ft., one target. Hit: 4 (1d6+1) bludgeoning damage, or 7 (1d8 +4) bludgeoning damage with shillelagh with two hands.

Light Crossbow. Ranged Weapon Attack: +4 to hit, range 80/320 ft., 1 target. Hit:  5 (1d8 + 1) piercing damage.

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