Actions

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.   Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: (2d10 + 8) piercing damage plus (2d6)fire damage.   Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: (2d6 + 8) slashing damage.   Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: (2d8 + 8) bludgeoning damage.   Frightful Presence. Each creature of the dragon's choice that is within 120 ft. of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.   Fire Breath (Recharge 5-6). The dragon exhales fire in a 60-foot cone. Each creature in that area must make a DC 21 Dexterity saving throw, taking 63 (18d6) fire damage on a failed save, or half as much damage on a successful one.

Legendary Actions

Adult Red Dragon 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. Adult Red Dragon regains spent legendary actions at the start of their turn.   Detect.The dragon makes a Wisdom (Perception) check.   Tail Attack.The dragon makes a tail attack.   Wing Attack (Costs 2 Actions).The dragon beats its wings. Each creature within 10 ft. of the dragon must succeed on a DC 22 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.