Bast, Spectre of Tragedy

Legendary Resistance (2/Day). If Bast fails a saving throw, he can choose to succeed instead.

War Caster. Bast has advantage on spell concentration saves and can cast a spell for his opportunity attack.

Relentless Attacker. Bast attacks twice on his turn when wielding Doomstar.

Vengeful Smite. When Bast hits with Doomstar, he can expend a spell slot to deal 2d8 extra necrotic damage to the target, plus 1d8 for each spell slot level higher than 1st (max 5d8).

Relentless Avenger. When Bast hits a creature with an opportunity attack, he can move up to half his speed immediately after the attack and as part of the same reaction without provoking opportunity attacks.

Regeneration. Bast regains 7d10 his points at the start of his turn.

Beguiling Influence. Bast is proficient in Deception and Persuasion.

Velanis's Sight. Bast can see normally in darkness up to 120 ft. Additionally, Bast has truesight.

Hand-Eye Coordination. Velanis's influence on Bast's physical form causes him to experience premonitions of danger and, unless incapacitated, Bast can’t be surprised.

Eldritch Mind. Bast has advantage on Constitution saving throws to maintain concentration on any of his spells.

Wicked Luck. When Bast rolls a 1 on the d20 for an attack roll, ability check, or saving throw, he can reroll the die and must use the new roll.

Spellcasting. Bast is a 20th-level spellcaster. His spellcasting ability is Charisma (spell save DC 20, +10 to hit with spell attacks). Bast has following warlock and paladin spells prepared:
Cantrips (at will): Frostbite, Green-Flame Blade, Minor Illusion, Toll the Dead
1st level (4 slots): Armor of Agathys, Bane, Ceremony, Command, Hellish Rebuke, Hex, Hunter's Mark, Shield of Faith
2nd level (3 slots): Aid, Blindness/Deafness, Find Steed, Hold Person, Locate Object, Mirror Image, Misty Step, Prayer of Healing, Warding Bond
3rd level (3 slots): Counterspell, Fly, Haste, Protection from Energy, Time Duplicity
4th level (3 slots): Banishment, Death Ward, Hallucinatory Terrain

Magical Secrets. Using his spellcasting stats, Bast may also cast each of the following spells once per day: Inflict Wounds, Sleep, Crown of Madness, Invisibility, Clairvoyance, Slow, Disintegrate, Eyebite, Finger of Death, Teleport, Dominate Monster, Tasha's Otherworldly Guise, and Wish

Turn Immunity. Bast is immune to effects that turn undead.

Doomstar. Melee Magic Weapon Attack: +14 to hit, reach 10 ft. Hit: 1d12+14 piercing damage. Bast rerolls any 1s or 2s on damage dice with melee weapons wielded with two hands.

Doomstar: Comet Strike. Within a 30ft straight line, Bast shoot towards that target, harnessing the comet's power, landing in a tile adjacent to the target. The target and anyone in the line must make a DC 18 Dexterity saving throw or take 5d12 force damage and be knocked prone. On a successful save, targets only take half damage and are not knocked prone. Bast can use this ability a number of times equal to his Constitution modifier (3).

Bone Liquify. Melee Spell Attack: +11 to hit, reach 5 ft., one creature with a skeleton. On a hit, the target must succeed on a DC 18 Constitution saving throw or drop to 0 hit points.

Form of Dread. Bast transforms himself into a horrifying aspect of Velanis's dread. For 1 minute he gains the following benefits:
- Gain temp HP equal to 10d10+11.
- If Bast hits a creature with a melee attack, they are forced to make a Wisdom saving throw (DC 20); on a fail, the target is frightened until the end of Bast's next turn.

Relentless Hex. As a bonus action, Bast can magically teleport up to 30 ft. to an unoccupied space he can see within 5 ft. of the target cursed by his hex spell or by another cursing warlock feature.

Necrotic Husk: Revival. When Bast would be reduced to 0 hit points, he can uses a reaction to drop to 1 hit point instead and causes his body to erupt with deathly energy. Each creature of Bast's choice that is within 30 feet of him takes necrotic damage equal to 2d10+11. Bast then gains 1 level of exhaustion.

Bast can take up to two legendary actions, choosing from the options below. Only one legendary actions can be used at a time, and only at the end of another creature's turn. Bast regains all spent legendary actions at the start of his turn.

Spellcaster (1 Action). Bast casts one of his spells, which does not include any spells granted from Magical Secrets.

Unholy Divinity: Arcane Subterfuge (1 Action). The diabolical power of Velanis fuels Bast's spells. As a legendary action, Bast allows Velanis's influence to empower him, regaining one expended spell slot, which can be no higher than level 3.

Unholy Divinity: Abjure Enemy (2 Actions). Bast may choose one creature within 60 ft. of him that he can see to make a WIS saving throw (DC 20). Fiends and undead have disadvantage on this saving throw. On failure, the creature is frightened and its speed is reduced to 0 (and it can't benefit from bonuses to speed) for 1 minute or until it takes any damage. On success, the creature’s speed is halved for 1 minute or until the creature takes any damage.

Unholy Divinity: Vow of Enmity (2 Actions). Bast may choose a creature within 10 ft. of him and gain advantage on all attack rolls against it for 1 minute or until the creature drops to 0 HP or falls unconscious.