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Image prompthuge crowned fey wildwood monarch, two-story living wood and vine body, bark skin showing four seasons at once blossom summer autumn winter, lashing root whips, shifting corrupted grove, ground coiling into difficult terrain, serene heartwood mask face, glowing seasonal eyes, dull cold iron glint among roots, towering regal pose, cold necrotic greens and frost blue, dark fantasy, grimdark, painterly digital art, dramatic chiaroscuro lighting, muted desaturated palette with corrupted-crimson accents, weathered post-Cataclysm atmosphere, intricate high detail, cinematic composition

Verdant Sovereign

Huge Fey, Chaotic Neutral
CR 16ControllerForest / Feywild
AC 19
HP 253 (22d12 + 110)
Speed 40 ft.
STR
20
+5
save +5
DEX
16
+3
save +8
CON
20
+5
save +10
INT
20
+5
save +5
WIS
22
+6
save +11
CHA
24
+7
save +12
Skills Insight +11, Nature +10, Perception +11
Resistances Cold, Necrotic; Bludgeoning, Piercing, Slashing (nonmagical)
Vulnerabilities Cold Iron
Immunities Charmed, Frightened, Poisoned
Senses Truesight 120 ft.; Passive Perception 21
Languages Sylvan, Elvish, Common; telepathy 120 ft.

Traits

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

Magic Resistance. Advantage on saving throws.

Wild Domain. All terrain within 60 feet of the Verdant Sovereign turns into Difficult Terrain or back to normal whenever the Sovereign wishes (no Bonus Action required — merely willing it is enough). This affects enemies; it does not affect allies.

Actions

Multiattack. The Sovereign makes two Root Lash attacks and uses one Season's Turn.

Root Lash. Melee Attack Roll: +10, reach 20 ft. Hit: 18 (3d8 + 5) Bludgeoning damage, and the target makes a DC 20 Strength save. Failure: The target has the Restrained condition (escape DC 20).

Season's Turn. The Verdant Sovereign calls forth a season. It chooses a 30-foot-radius area and applies one of the following effects:

SeasonEffect (DC 20 CON save)
SpringFailure: The target is Charmed (1 min). A Charmed target cannot attack the Sovereign.
SummerFailure: 32 (5d12) Fire damage. Success: Half.
AutumnFailure: The target gains 1 level of Exhaustion.
WinterFailure: 27 (6d8) Cold damage and Speed 0 (1 turn).

Grasping Wildwood (Recharge 5–6). Every enemy in a 40-foot Emanation makes a DC 20 Dexterity save. Failure: 45 (10d8) Piercing damage, and the target has the Restrained condition (escape DC 20). Success: Half damage.

Legendary Actions

The Sovereign can take 3 legendary actions per round (chosen when another creature's turn ends):

Shift Terrain. Reshapes the Wild Domain area; also, an enemy within 60 feet makes a DC 20 STR save, moving 15 feet on a failure.

Root Lash (Costs 2). Makes one Root Lash attack.

Season's Whisper (Costs 3). Uses Season's Turn.

How to Use

The queen/king of the Feywild. Designed as a boss fight.

Season's Turn means a different threat every turn. The party can't rely on a single defense — dodging Summer thanks to Fire Resistance just gets them caught by Winter.

Key

Cold Iron (Vulnerability!) and burning through Legendary Resistance — there are 3, so spend them first (with low-level save effects like Bane or Hold Monster), then unleash your real spell.