Bel (2024 Version)

Diabolical Restoration. If Bel dies outside the Nine Hells, his body disappears in sulfurous smoke, and he gains a new body instantly, reviving with all his Hit Points somewhere in the Avernus.

Fear Aura. Bel emanates an aura in a 30-foot Emanation while he doesn't have the Incapacitated condition. Wisdom Saving Throw: DC 24, any enemy that starts its turn in the aura. Failure: The target has the Frightened condition until the start of its next turn. Success: The target is immune to Bel's aura for 24 hours.

Legendary Resistance (4/Day, or 5/Day in Lair). If Bel fails a saving throw, he can choose to succeed instead.

Magic Resistance. Bel has Advantage on saving throws against spells and other magical effects.

Multiattack. Bel makes one Discombobulating Tail attack and two Greatsword attacks.

Discombobulating Tail. Melee Attack Roll: +17 to hit, reach 10 ft. Hit: 25 (3d10 + 9) Bludgeoning damage, and the target has the Stunned condition until the start of Bel's next turn.

Greatsword. Melee Attack Roll: +17 to hit, reach 10 ft. Hit: 23 (4d6 + 9) Force damage plus 21 (6d6) Fire damage. If this damage reduces the target to 0 Hit Points, Bel kills and decapitates it.

Spellcasting. Bel casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 24):

At Will: Detect Magic, Dispel Magic, Fireball (level 5 version), Hold Monster (level 7 version), Mirror Image, Mislead, Raise Dead, Teleport, Wall of Fire (level 6 version)

1/Day Each: Imprisonment, Meteor Swarm

Commanding Rush. Each ally within 120 feet of Bel can take a Reaction to move up to half the ally's Speed without provoking Opportunity Attacks. Bel can also move up to half his Speed without provoking Opportunity Attacks.

Tactical Edge. Trigger: Bel or an ally within 120 feet is hit by an attack roll. Response: The target subtracts 1d12 from that attack, possibly causing it to miss.

Legendary Action Uses: 3 (4 in lair). Immediately after another creature's turn, Bel can expend a use to take one of the following actions. Bel regains all expended uses at the start of each of his turns.

Hellfire Arcana. Bel uses Spellcasting to cast (A) Fireball (level 5 version) or (B) Wall of Fire (level 6 version). Bel can't take this action again until the start of his next turn.

Immobilize. Bel uses Spellcasting to cast Hold Monster (level 7 version). Bel can't take this action again until the start of his next turn.

Martial Assault. Bel moves up to half his Speed without provoking Opportunity Attacks, and he makes one Greatsword attack.