Jabberwock

Jabberwock CR: 15

Huge dragon, chaotic evil

Armor Class: 18 (natural armour)

Hit Points: 115 (10d12 + 50)

Speed: 30 ft , fly: 60 ft , swim: 60 ft , climb: 30 ft

STR

20 +5

DEX

12 +1

CON

20 +5

INT

4 -3

WIS

7 -2

CHA

11 +0

Saving Throws: STR +10, DEX +6, CON +10, INT +2, WIS +3, CHA +5

Skills: Perception +8

Damage Vulnerabilities: Slashing from a Vorpal Sword

Damage Immunities: Poison

Condition Immunities: Charmed, Frightened, Poisoned

Senses: Truesight 120 ft., Passive Perception 18

Languages: =

Challenge Rating: 15 ( 10,000 XP)

Proficiency Bonus: +5

Confusing Burble. The jabberwock burbles to itself unless it is incapacitated. Any creature that starts its turn within 30 feet of the jabberwock and is able to hear its burbling must make a DC 18 Charisma saving throw. On a failed saving throw, the creature can’t take reactions until the start of its next turn, and it rolls a d4 to determine what it does during its current turn: 1–2. The creature does nothing.
3. The creature does nothing except use all its movement to move in a random direction.
4. The creature either makes one melee attack against a random creature it can see or does nothing if no visible creature is within its reach.
Legendary Resistance (3/Day). If the jabberwock fails a saving throw, it can choose to succeed instead.
Regeneration. The jabberwock regains 10 hit points at the start of its turn. If the jabberwock takes slashing damage, this trait doesn’t function at the start of its next turn. The jabberwock dies only if it starts its turn with 0 hit points and doesn’t regenerate.
Uncanny Tracker. The jabberwock can unerringly track any creature it has wounded in the last 24 hours, and it knows the distance and direction to its quarry as long as the two of them are on the same plane of existence.

Actions

Multiattack. The jabberwock makes two Rend attacks.
Rend. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 21 (3d10 + 5) slashing damage.
Tail. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 10 (1d10 + 5) bludgeoning damage.
Fiery Gaze (Recharge 5–6). Unless it is blinded, the jabberwock emits a 120-foot-long, 5-foot-wide line of fire from its eyes. Each creature in that line must make a DC 18 Dexterity saving throw, taking 31 (7d8) fire damage on a failed save, or half as much damage on a successful one.

Legendary Actions

The jabberwock 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. The jabberwock regains spent legendary actions at the start of its turn.
Tail Attack. The jabberwock makes one Tail attack.
Rend Attack (Costs 2 Actions). The jabberwock makes one Rend attack.
Wing Attack (Costs 3 Actions). The jabberwock beats its wings. Each creature within 10 feet of the jabberwock must succeed on a DC 18 Dexterity saving throw or take 8 (1d6 + 5) bludgeoning damage and be knocked prone.

A jabberwock is a solitary, temperamental predator that haunts pristine forests and ancient ruins. Accurate descriptions of jabberwocks are difficult to come by, because the rare survivors of an encounter with one retain only a confused impression of its parts and not a sense of the whole. Pieced-together accounts describe it as a sinewy, dragon-like creature that can walk on its hind legs as easily as it travels on all four. Its eyes can emit fiery beams. Once a jabberwock has chosen its target, it concentrates its attacks on that target until the victim is killed (and devoured), until the jabberwock is killed, or until the target escapes using teleportation magic or other means.
If a jabberwock is slain, another one appears 3d8 years later, materializing within a thousand miles of where the old one perished. No immature jabberwock has ever been sighted, and the creature does not appear to age.

Suggested Environments

Feywild, deep forests, old ruins