Aliguiestia

Amphibious. Aliguiestia can breathe air and water.

Cosmophibious. Aliguiestia can breath in space.

Keen Lesser Senses. Aliguiestia has advantage on Wisdom (Perception) checks that rely on sight, smell, and hearing.

Sense Magic. Aliguiestia senses magic within 120 feet of her at will. This trait otherwise works like the detect magic spell but isn't itself magical.

Touch of Darkness. Whenever Aliguiestia hits with a melee attack, the target must make a DC 16 Constitution saving throw or take 14 (2d8+4) necrotic damage on a failed save, or half as much on a success (included in the attack).

Innate Spellcasting. Aliguiestia's innate spellcasting ability is Charisma (spell save DC 15). Aliguiestia can innately cast the following spells, requiring no material components:

At will: acid arrow, alarm, arcane lock, bestow curse, blinding smite, cloud of daggers, conjure minor elemental

2/day: black tentacles, blade barrier, arcane eye, conjur volley, control winds, cone of cold, call lightning.

1/day: circle of death, circle of power, destructive wave, flame strike

Multiattack. Aliguiestia makes four attacks. Two with it's claws and two with its tentacles. Aliguiestia can also replace all four attacks with three rock throw attacks or replace just one with a bite attack.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 20 (3d10+2) slashing damage. The target must make a DC 16 Constitution saving throw or take 14 (2d8+4) necrotic damage on a failed save or half as much damage on a success. 

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 18 (2d10+6) piercing damage plus 10 (2d6+3) poison damage. The target must make a DC 16 Constitution saving throw or take 14 (2d8+4) necrotic damage on a failed save or half as much damage on a success. 

Tentacle. Melee Weapon Attack: +7 to hit, reach 10 ft., 1 target. Hit: 16 (2d10+4) bludgeoning damage. The target must make a DC 16 Constitution saving throw or take 14 (2d8+4) necrotic damage on a failed save or half as much damage on a success. Aliguiestia can also choose to deal no damage and just grapple the target (escape DC 16). The target has the same effects of being grappled combined with the affects of being frightened while being grappled in this way.

Wings. Melee Weapon Attack: +6 to hit, reach 15 ft., 1 target. Hit: 21 (3d10+2) bludgeoning damage and the target must make a DC 17 Strength saving throw or be knocked back 25 feet from their current location. The target must make a DC 16 Constitution saving throw or take 14 (2d8+4) necrotic damage on a failed save or half as much damage on a success.

Cross Chop. Melee Weapon Attack: +7 to hit, reach 10 ft., 1 target. Hit: 20 (3d10+2) slashing damage and the target must make a DC 15 Constitution saving throw or have it's AC decreased by 1. If Aliguiestia wants, she can use this attack as a reaction. If she does, if the target fails on the saving throw, the target not only gets their AC decreased by 1 but also is frightened until Aliguiestia's next turn.   

Rock Throw. RangedWeapon Attack: +7 to hit, range 20/600 ft., 1 target. Hit: 24 (4d10+1) bludgeoning damage and 2 psychic damage.

Frightful Presence. Each creature of Aliguiestia's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 13 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 Aliguiestia's Frightful Presence for the next 20 hours.

Finger Rays. Aliguiestia shoots two of the following magical finger rays at random (reroll duplicates), choosing one to two targets it can see within 120 feet of it:

1. Paralyzing Ray. The target must succeed on a DC 15 Constitution saving throw or be paralyzed for 1 minute. the target can repeat the saving throw at the end of each of it's turns, ending the effect on a success.

2. Slowing Ray. The target must succeed on a DC 15 Dexterity saving throw. On a failed save, the target's speed is halved for 1 minute. In addition, the target can't take reactions.

3. Telekinetic Ray. If the target is a creature, it must succeed on a DC 15 Strength saving throw or Aliguiestia moves it up to 35 feet in any direction. It is retrained by the ray's telekinetic grip until the start of Aliguiestia next's turn or until she is incapitated. If the target is an object weighing 320 pounds or less that is not being worn or carried, it is moved up to 35 feet in any direction. Aliguiestia can also exert fine control on objects with this ray, such as manipulating a simple tool or opening a door or other unlocked container.

4. Sleep Ray. The target must succeed on a DC 14 Wisdom saving throw or fall asleep and remain unconcious for 1 minute. The target awakens if it takes damage or another creature uses an action to wake it. This ray has no effect on constructs and undead.

5. Disintegration Ray. The target must succeed DC 15 Dexterity saving throw or take 29 (5d10+1) force damage. If this damage reduces the creature to 0 hit points, its body becomes a pile of fine gray dust.  If the target is a Medium or smaller nonmagical object or creation of magical force, it is disintegrated without a saving throw. If the target is a Huge or larger object or creation of magical force, this ray disintegrates a 10-foot cube of it. 

Arcane Shield (2/Day). Aliguiestia creates a magical shield that surround most of her body. Any creature that is within 5 feet of Aliguiestia when she uses this action must make a DC 12 Strength saving throw or be pushed back 5 feet from Aliguiestia. The shield grants her a +2 bonus to her AC. The shield lasts until Aliguiestia uses this action again, dismisses the shield as a bonus action, or until 2 rounds have passed.

Aliguiestia 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. Aliguiestia regains spent legendary actions at the start of its turn.

Finger Ray. Aliguiestia uses one random finger ray.

Arcane Shield (Costs 2 Actions). Aliguiestia uses her arcane shield.

Spell Chain (Costs 2 Actions). Aliguiestia casts up to three spells in consecutive order. She cannot cast more than two damaging spells and she cannot cast more than one spell that inflicts the target with a condition.

Celestial Strength (Costs 3 Actions). Aliguiestia's Strength and Constitution modifiers magically increase by 6, she has advantage on Strength and Constitution saving throws, and cannot be stunned until 5 rounds have passed.

Disintegration Blast (Costs 3 Actions). Aliguistia uses two of her disintegration finger rays at once. This attack has the same effect as her disintegration finger ray excpet the DC for the Dexterity save is 19 and the target takes 60 (9d10) force damage instead. Once this attack is used, Aliguiestia has disadvantage on attack rolls and automatically on any attack rolls with her finger rays.