Adult Wyvern

Loft Guardian

The adult wyvern has advantage on Wisdom (Perception) checks and Wisdom saving throws while within its nesting territory or the wyvern lofts.

Mountain Sovereign

The adult wyvern ignores difficult terrain caused by rock, scree, rubble, snow, ice, nest debris, and narrow cliff paths.

Terrifying Display

As a bonus action, the adult wyvern may spread its wings, raise its tail barb, and release a deep territorial roar. Each creature of the wyvern’s choice within 60 feet that can see or hear it must succeed on a DC 15 Wisdom saving throw or become frightened until the end of its next turn.

A creature that succeeds on this save is immune to this wyvern’s Terrifying Display for 24 hours.

Aerial Predator

If the adult wyvern moves at least 30 feet straight toward a creature while flying and then hits it with a Claws attack on the same turn, the target must succeed on a DC 17 Strength saving throw or be knocked prone.

Multiattack

The adult wyvern makes three attacks: one with its Bite, one with its Claws, and one with its Tail Barb.

Bite

Melee Weapon Attack: +9 to hit, reach 10 ft., one target.
Hit: 17 piercing damage.

Damage: 2d10 + 6 piercing

Claws

Melee Weapon Attack: +9 to hit, reach 5 ft., one target.
Hit: 15 slashing damage.

Damage: 2d8 + 6 slashing

Tail Barb

Melee Weapon Attack: +9 to hit, reach 15 ft., one target.
Hit: 12 piercing damage, and the target must make a DC 16 Constitution saving throw. On a failed save, the target takes 28 poison damage. On a successful save, the target takes half as much poison damage.

Damage: 1d12 + 6 piercing plus 8d6 poison

Wing Maelstrom — Recharge 5–6

The adult wyvern beats its massive wings, scattering loose rock and forcing the air outward. Each creature within 15 feet of the wyvern must make a DC 17 Strength saving throw. On a failed save, a creature takes 13 bludgeoning damage, is pushed 15 feet away, and falls prone. On a successful save, the creature takes half damage and is not pushed or knocked prone.

A creature pushed off a ledge may attempt a DC 15 Dexterity saving throw to grab the edge.

Damage: 3d8 bludgeoning

Terrifying Display

The adult wyvern uses its Terrifying Display trait.

Launch

The adult wyvern leaps into the air and flies up to half its flying speed. This movement does not provoke opportunity attacks from frightened or prone creatures.

Guardian’s Tail

When a creature within 15 feet of the adult wyvern targets one of the wyvern’s young, its nest, or a bonded rider with an attack, the wyvern may make one Tail Barb attack against that creature.

Wing Shield

When the adult wyvern or a creature within 5 feet of it is hit by a ranged weapon attack, the adult wyvern may partially shield the target with one wing, reducing the damage by 10.