Ancient Force Dragon

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

Amphibious. The dragon can breathe air and water.

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Alertness. Dragon gets a +2 bonus on all Listen checks and Spot checks.

Displacement. An ancient force dragon’s deflecting force bends light even more extremely, giving the dragon the benefit of the displacement spell (50% miss chance). This supersedes its blur ability.

Invisibility. A great wyrm force dragon is a creature of pure force, and is completely invisible (as though protected by greater invisibility). A creature that can see invisible creatures must still contend with the dragon’s displacement ability.

Spell-Like (3/day). forcecage, maze, resilient sphere, telekinetic sphere, wall of force. The DCs are Charisma-based.

A force dragon’s natural weapons are treated as epic for the purpose of overcoming damage reduction.

Bite. Melee Weapon Attack: +20 to hit, reach 20Ft., one creature. Hit: (6d8+20) PIERCE.

Claw. Melee Weapon Attack: +20 to hit, reach 15Ft., one creature. Hit: (4d8+20) Slash.

Wing Attack. Melee Weapon Attack: +20 to hit, reach 10Ft., one creature. Hit: (4d4+20) Bludgeon.

Tail slap. Melee Weapon Attack: +20 to hit, reach 25Ft., one creature. Hit: (4d8+30) Bludgeon.

Gravity Bomb: A ball of compressed gravity is released from the mouth of the dragon at a target within 200ft, on failed DC 23 CON save take 23d12 force damage and loss a body part that has been crushed by the immense pressure of gravity. On success take no damage but are slowed for 2 turns.

Breath Attack. A force dragon has one of breath weapon, a cone of force that tears through creatures and objects in its area to devastating effect. Breath Attack: +20 to hit, reach 60Ft., Cone. Hit: (45d12) force. Recharge 2 turns

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 29 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.

Reaction: Has 3 reactions per round.

Force Blast: Able to let out an explosion of force in a 30ft radius around it to push enemies back that distance. 

The 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. The dragon regains spent legendary actions at the start of its turn.

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 26 Dexterity saving throw or take (4d4+20) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.