Chimera Queen

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

Limited Magic Immunity. The Chimera Queen is immune to all spells 4th Level or lower.

Siege monster. Due to the Chimera Queen’s large size, she deals double damage to objects and structures.

Spellcasting. The Chimera Queen is a 18 level spellcaster. Its spellcasting ability is charisma (spell save DC 18, +10 to hit with spell attacks). The Chimera Queen has following sorcerer spells prepared: 

Cantrips (at will): Control flames, create bonfire, fire bolt 
1st level (4 slots): Earth tremor, shield, burning hands

2nd level (3 slots): Dragons breath, scorching ray, phantasmal force

3rd level (3 slots): Fire ball, melphs minute meteors

4th level (3 slots): wall of fire, dimension door, polymorph

5th level(3 slots): telekinesis, wall of stone

6th level (2 slots): Investiture of flame, disintegrate

7th level (2 slots): Delayed blast fireball, fire storm

8th level (1 slot): Earthquake, incendiary cloud

9th level (1 slot): power word kill, phsycic sceam 

The Chimera Queen makes 3 attack’s. 1 with its claws, one with its bite, and  1 with its horns.

Claw. Melee Weapon Attack: +10 to hit, reach 10ft., 1 target. Hit:  39(8d6 + 15) slashing damage. 

Bit. Melee Weapon Attack: +10 to hit, reach 5ft 1 target. Hit: 23 (3d10 + 8) piercing damage.

Horns. Melee weapon attack: +10 to hit, reach 5 ft 1 target. Hit: 20 (2d10+10) piercing damage. If the Chimera Queen runs at least 50 feet before hitting the target, the target takes an extra 2d10 damage.

Fire Breath. Recharge 5-6: the Chimera Queens Dragon head blows fire in a 60 foot come. Every target must make a dc 20 dexterity saving throw. On a failed save the target takes 60 (10d10 +10) fire damage.

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

Wing beat (Costs 1 Actions). The Chimera Queen beats its wings. All creatures in a 10 foot radius take 30 (4d10+10) bludgeoning damage 

Roar (Costs 2 actions). The Chimera Queen roars. Every creature that can hear it must make a dc 20 wisdom saving throw, or be frightened of the Chimeræ Queen for 2 turns. If they succeed, they are unable to be frightened of the Chimeræ Queen for 24 hours.

Call Chimera 5-6 (Costs 2 actions) (recharge 5-6). The Chimera Queen issues a high-pitched noise that only Chimera can hear. 1d10-4 Chimera Head the roar, and come to her aid.