Revised Elder Red Dragon

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: +16 to hit, reach 15ft., one target. Hit: 20 2d10+9 piercing damage plus 11 (2d10) fire damage.   Claw. Melee Weapon Attack: +16 to hit, reach 10 feet, one target. Hit: 16 2d6+9 slashing damage.   Tail. Melee Weapon Attack: +16 to hit, reach 20 feet, one target. Hit: 18 2d8+9 bludgeoning damage   Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 20 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 6). The dragon exhales fire in a 80-foot cone. Each creature in that area must make a DC 23 Dexterity saving throw, taking 83 24d6 ] fire damage on a failed save, or half as much damage on a successful one.   Immolation(Recharge 5-6). The dragon spits a ball of fire at one creature within 60 feet. The target must make a DC 21 Dexterity saving throw taking 28 (8d6) fire damage on a failure and if the target is a creature or a flammable object, igniting or taking half as much damage and not catching fire on a sucessful save. Until a creature douses the fire, with at least 5 gallons (= ~20 litres) of water, it takes 10 (3d6) fire damage at the start of each of its turns.    

Legendary Actions

The dragon can take 2 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 dragon regains spent legendary actions at the start of its 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 15 feet of the dragon must succeed on a DC 21 Dexterity saving throw or take 16 2d6+9 bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.