Amos

Infernal Despair. Each creature within 30 feet of Amos that isn’t a devil makes saving throws with disadvantage.

Legendary Resistance (3/Day). If Amos fails a saving throw, he can choose to succeed instead.

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

Regeneration. Amos regains 20 hit points at the start of his turn. If he takes radiant damage, this trait doesn’t function at the start of his next turn. Amos dies only if he starts his turn with 0 hit points and doesn’t regenerate.

Spellcasting. Amos is a 20th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 24, +16 to hit with spell attacks). Amos has following Sorcerer and Warlock spells prepared:

Cantrips (at will): Acid Splash, Eldritch Blast,  Inflict Wounds, Mending, Message, Mind Sliver, Prestidigitation, Ray of Frost, Toll the Dead

1st level (6 slots): Armor of Agathys, Charm Person, Chromatic Orb,  Detect Magic,  Expeditious Retreat, Mage Armor, Witch Bolt

2nd level (3 slots): Dragon's Breath, Invisibility

3rd level (3 slots): Counterspell, Dispel Magic, Sleet Storm

4th level (3 slots): Vitriolic Sphere

5th level (3 slots): Dominate Person, Synaptic Static

6th level (1 slots): Disintegrate

7th level (1 slots): Delayed Blast Fireball

8th level (1 slots): Power Word Stun

9th level (1 slots): Wish

Subtle Spell. When Amos casts a spell, he does so without V, S, or M components.

Wild Magic. When Amos casts a spell, roll on the Wild Magic table, ignoring detrimental effects.

Inflict Wounds. Amos casts Inflict Wounds. +16. (17) 3d10 Necrotic Damage.

Eldritch Blast. Amos casts Eldritch Blast. 4 blasts. 300 ft., +16. (14) 1d10+8 Force Damage.

Teleport. Amos magically teleports, along with any equipment he is wearing and carrying, up to 120 feet to an unoccupied space he can see.

Dragon's Breath. Amos Casts Dragon's Breath.

Expeditious Retreat. Amos casts Expeditious Retreat.

Counterspell. Amos casts counterspell.

Fearful Voice (Recharge 5–6). In response to taking damage, Amos utters a dreadful word of power. Each creature within 30 feet of him that isn’t a devil must succeed on a DC 24 Wisdom saving throw or become frightened of him 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. A creature that saves against this effect is immune to his Fearful Voice for 24 hours.

Amos 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. Amos regains spent legendary actions at the start of his turn.

Cantrip. Amos casts one cantrip.

Teleport. Amos uses Teleport.

Lightning Storm (Costs 2 Actions). Amos releases lightning in a 30-foot radius, blocked only by total cover. All other creatures in that area must each make a DC 24 Dexterity saving throw, taking 18 (4d8) lightning damage on a failed save, or half as much damage on a successful one.