Adult Nature Dragon

Amphibious. The dragon can breathe air and water.

Legendary Resistance (4/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon can use its Frightful Presence. It then makes four attacks: one with its bite, two with its claws and one tail.

Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit:  (3d10 + 8) piercing damage plus 4 (1d8) acid damage.

Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit:  (4d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., multiple targets. Hit: 15 (2d8 + 6) bludgeoning damage.

Fire Breath The dragon exhales fire in a 60-foot cone. Each creature in that area must make a DC 20 Constitution saving throw, taking (10d6 + 12) poison damage on a failed save, or half as much damage on a successful one. The action can be used 3 times a day.

Brain Damage The dragon makes a sound. All creatures in a range of 30 ft must make a DC 18 Constitution saving throw or take (6d8 + 6) on a failed saving throw and half a damage on a successful one.

Wings. The dragon uses its wings to and all creatures in a range of 30 ft take (2d6+4) and must make a DC dexterity saving throw or go 10 ft away from the dragon.

The Nature dragon has oppertunity attack if a creature walk out of its attackspace.

If one of the dragons kids is being attacked the dragon (only a female dragon) has a oppertinty to save the kid if the dragon rules DC 16 dexterity saving throw. If the dragon succes the attck goes to the adult dragon. The reaction can be used 3 times a day.

If a player dealse more damage than 50 the dragon can role a d12 + 6 and take the number from the damage.

Adult Nature Dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option + the dragons normal actions. All legendary actions can be used 2 times a day.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes two tail attacks.

Water Breath. The dragon makes a breath of water and every creature in the area of 50 ft must make a Dexterity saving throw DC 18, taking 60 (5d12) damage on a failed saving throw, or half as much damage on a successful one.