Keen Smell and Mind. Aar'Khos has advantage on Wisdom (Perception) checks that rely on smell. He also has the feat Keen Mind.

Intimidating Presence.  His sole presence makes others shiver. Aar'Khos has advantage on Charisma (Intimidation) checks towards non-botanimals creatures.

Sylvan Stag. While Aar'Khos walks between trees or in his lair, he becomes indistinguishable unless he wants to be seen or is in combat.

Fey-Diety resistances. As a fey-deity, Aar'Khos is heavenly resistant to conditions (see the list on the top). 

Botanimals Deity. As one of the Botanimals' Deities, he is extremely protective of his kind. Attacking any Botanimals in his lair or within his vicinity automatically triggers a fight as he initiates it with one of his legendary abilities. 

Legendary Resistance (3/Day). If he fails a saving throw, he can choose to succeed instead.

 Seasonal Shift.  Aar'Khos inflects bonus damages that change with his current Season Coat. (Depending on the current season where he lives)

1. Winter: Cold Damage.
2. Spring: Slashing Damage.
3. Summer: Fire Damage.
4. Autumn: Thunder Damage.

Season Coat.  Aar'Khos's beautiful appearance shifts drastically between each season. The current season gives Aar'Khos different types of bonuses and effects.

1. Winter Coat. Aar'Khos's fur becomes White, Cyan, and Brown and is way thicker. The leaves are crystalized in ice and shine when the light comes through. An aurora Borealis shines through the leaves and it perpetually snows around him. He gains resistance against cold damage. His Seasonal Shift becomes Winter. 
   
   
2. Spring Coat. Aar'Khos's fur becomes a bright Green, Blue, and Teal and starts to shed a bit. The leaves are numerous, long, and loose with colorful flowers. A pleasant breeze comes through the leaves and it smells wonderful as life grows beneath each step. He gains resistance against necrotic damage. His Seasonal Shift becomes Spring.
   
   
3. Summer Form. Aar'Khos's fur is much shorter, Yellow, Red, and dark Green. The leaves are short and start to turn from green to yellow. Bright light and pleasant heat emanate through his appearance. The grass beneath his walk becomes dry and amber. He gains resistance against Poison damage. His Seasonal Shift becomes Summer.
   
   
4. Autumn Form. Aar'Khos's fur starts to regrow as it becomes Gamboge, Crimson, and Auburn. The leaves are wet as perpetual rain falls around him clouding the area around him. Where he walks, puddles, shrooms, and fallen leaves are left behind. He gains resistance against fire damage. His Seasonal Shift becomes Autumn.

Basic attacks abilities:

Multiattacks. Aar'Khos swings his head two times, piercing two times his targets with his antlers and one time with his magical leaves.

Antlers. Melee Weapon Attack: +5 to hit, reach 15 ft., up to three targets. Hit: 15(1d12 + 4) Piercing damage and an additional 1d8 damage based on the current Seasonal Coat.

Magical Leaves. Melee Weapon Attack: +5 to hit, reach 30 ft., up to three targets. Hit: 18(1d12 + 6) Slashing damage and deal an additional 1d8 damage based on the current Seasonal Coat.

Special Abilities:

Seasonal Ray. (Recharge 1d4) Aar'khos focuses his energy towards him and shoots a ray of pure energy in a line up to 100ft and 5ft wide. Every entity in the line has to make a Dexterity saving throw (DC 14). On a failed saving throw, the target takes 4d12 damages based on Aar'Khos's Seasonal Coat, they take none on a successful one.

Thunderous step. (Recharge 1d6) Aar'khos smashes his hooves on the ground, creating a thunder-like sonic boom around him. Every unit around him in a 15 ft radius must make a Constitution saving throw (DC 15), taking 5d12 thunder damage on a failed save, half as much on a successful one. The thunder can be heard within a 150 ft radius. 

As a bonus action, Aar'Khos can use one of the following abilities.

Mystical. (Recharge 3) Aar'Khos is briefly surrounded by silvery mist, and teleport up to 60 ft to an unoccupied space that he can see.

Golden Tears. (Recharge 2) Aar'Khos weeps a golden tear that, regrows every dead or dying plant and Botanimals in a 60 ft radius around him. On another specific target, the tear heals the target of 2d8+5 Hitpoints. He cannot use it on himself.

When his health (total Hitpoints) goes under 50% (half of his total Hitpoints) Aar'Khos instantly uses his reaction to use the following abilities (only once per battle)

1. Forcing boom. He hurls a powerful shockwave around him, and every creature in his surrounding (50ft radius) must succeed on a Constitution saving throw (DC 18 with disadvantage) or be knocked back and prone on the ground. Decor and objects that aren't heavily tied to the ground are broken.
2. Lighting rain. Every target Aar'Khos considers as his enemy is struck by lightning, it automatically hits and crits prone targets. Each target has to make a Dexterity saving throw (DC 15). On a failed saving throw, they take 10d6 + 10 lightning damage, on a success, they barely dodge the lightning and only take half damage.

Aar'Khos can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. He regains spent legendary actions at the start of its turn.

Legendary Actions:

Camouflage. (Recharge 1d4) (Costs 2 actions) Aar'Khos disappears in the blink of an eye. He becomes undetectable and invisible until the beginning of his turn or if he takes any damage or uses any other Legendary action.

Swing. (Costs 1 action) Aar'Khos swings his head and counterattacks his opponent with his Antlers. (Only works on Melee attacks)

Intimidation. (Costs 1 action) Aar'Khos's gaze freezes his target action, they receive a minus d6 on their next attack roll.