Avathian

Awful Focus. Avathian has advantage on saving throws to maintain concentration on spells.

Aura of Despair. Any creature that starts its turn within 30 feet of Avathian must succeed on a DC 23 Wisdom saving throw or become frightened of Avathian until the start of their next turn. Any creature that fails this saving throw by 5 more is paralyzed as well, as fear grips their body.

Legendary Resistance. If Avathian fails a saving throw, she can choose to succeed instead.

Magic Resistance. Avathian, Eater of Gods has advantage on saving throws against spells and other magical effects.

Spellcasting. Avathian, Eater of Gods is a 20th-level spellcaster. Avathian, Eater of Gods's spellcasting ability is Charisma (spell save DC 23, +16 to hit with spell attacks). Avathian, Eater of Gods has the following sorcerer spells prepared:

Cantrip (at will): fire bolt, ray of frost, poison spray, chill touch, mind sliver, shocking grasp
1st level (5 slots): chaos bolt, detect magic, magic missile, ice knife, sleep
2nd level (4 slots): blindness/deafness, blur, detect thoughts, hold person, invisibility, misty step, scorching ray
3rd level (4 slots): counterspell, dispel magic, fireball, lightning bolt, tidal wave
4th level (3 slots): banishment, blight, greater invisibility, ice storm, sickening radiance, vitriolic sphere
5th level (3 slots): cloudkill, immolation, synaptic static, wall of light
6th level (3 slots): chain lightning, eyebite, mass suggestion, scatter
7th level (2 slots): etherealness, power word pain, prismatic spray, teleport
8th level (2 slots): dominate monster, sunburst
9th level (2 slots): psychic scream, time stop

Multiattack. Avathian makes seven attacks: one with its Bite, one with its Horns, two with its Claw, two with its Wings, and one with its Tail, or can cast one spell and one 

Titanic Bite. Melee Weapon Attack: +24 to hit, reach 35 ft., 1 target. Hit: 39 (4d12 + 15) [piercing] damage plus 21 (6d6) [radiant] damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and Avathian can’t bite another target.

Action Ranged Attack. RangedWeapon Attack: +# to hit, range #/# ft., # target. Hit: # (#d# + #) [damage type] damage.

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