Astral Tyrannosaurus Rex

Astral form. This dinosaur's form has been modified to use the powers of the Astral. This leads to the animal healing 10 HP at the start of his every turn, unless it reached 0 HP.

Gravitational pull. At the start of it's turn, the Rex pulls every creature with in 60 ft. of it 15 ft. closer, or if it's within 30 ft. only 10 feet closer. To avoid this the pulled creature must succeed in a DC 19 Dexterity or Strength saving throw. Only creatures who succeeded can fly within 30 ft. of the rex, all others fall on the ground.

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

Magic Resistance. The Rex has advantage on saving throws against spells and other magical effects.

Multiattack. The tyrannosaurus makes one Bite attack and one Tail attack.

Bite. Melee Attack Roll: +12; reach 10 ft. Hit: 34 (4d12 + 8) Magical Piercing damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 18). While Grappled, the target has the Restrained condition and can’t be targeted by the tyrannosaurus’s Tail.

Tail. Melee Attack Roll: +12; reach 15 ft. Hit: 26 (4d8 + 8) Magical Bludgeoning damage. If the target is a Huge or smaller creature, it has the Prone condition.

Active pull (Recharge 5-6). The rex activates it's Gravitational pull ability again this turn.

Suck the Arcane (Recharge 5-6). The Rex sucks the magic out of every creature within 30 ft. of it. Every creature that can cast spells has to succeed a saving throw with their spell casting ability. The DC for this save is 18. If they succeed nothing happens, but if they fail they lose one of their highest spell slot, and the Rex heals for the sum of those spell slots.

Backfire. When anyone would deal radiant damage to this rex, it can shoot a 60ft. long line. In that area all creatures have to succeed in a DC 18 Constitution saving throw or be blinded until the end of those creatures next turn. Regardless if they succeed they all get 14 (4d6) radiant damage.

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

Attack. The rex makes one tail attack.

Move. The rex moves up to half its speed.

Gamma burst (Costs 3 Actions).The rex can use the attack from it's Backfire reaction.

Recharge (Costs 3 Actions). The rex instantly recharges it's Active pull  or Suck the Arcane ability. It is the rex's choice which to recharge.