Baaltraxx

Abyssal Sovereignty. Baaltraxx’s attacks and abilities are magical. He ignores resistance to fire, necrotic, and force damage. When Baaltraxx deals damage to a creature, he can choose to treat that creature as if it were on the same plane of existence as him for the purpose of his abilities until the end of Baaltraxx’s next turn. 

Ancient One. Baaltraxx has advantage on saving throws against spells and other magical effects. 

The First Demon. Baaltraxx cannot be permanently killed while he remains within the Abyss. If reduced to 0 hit points outside the Abyss, his body is destroyed and he returns to The Source after 1d100 years. Within The Source, he instead reforms after 1d10 days unless The Source itself is destroyed. 

Eldritch Mind. Baaltraxx can’t have his thoughts read, and creatures have disadvantage on Charisma (Deception) checks made against him. 

He automatically knows when a creature within 120 feet is attempting to deceive, manipulate, or magically influence him. 

Legendary Resistance (5/Day). If Baaltraxx fails a saving throw, he can choose to succeed instead. 

Magical Resistance. Baaltraxx has advantage on saving throws against spells and other magical effects. 

Magic Weapons. Baaltraxx’s weapon attacks are magical. 

Siege Monster. Baaltraxx deals double damage to objects and structures. 

Unholy Regeneration. Baaltraxx regains 30 hit points at the start of his turn. If Baaltraxx took radiant damage since the end of his previous turn, this trait doesn’t function until the end of his next turn. 

Winged Colossus. Baaltraxx’s immense wings do not provoke opportunity attacks when he flies. 

Multiattack. Baaltraxx makes four attacks, choosing from Claw, Bite, and Tail. He can replace one attack with Eldritch Ray. 

Claw. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 27 (3d10 + 10) slashing damage plus 13 (3d8) necrotic damage. If the target is Huge or smaller, Baaltraxx can force it to make a DC 27 Strength saving throw. On a failure, it is knocked prone and pulled up to 20 feet toward Baaltraxx. 

Bite. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 36 (4d12 + 10) piercing damage plus 18 (4d8) fire damage. If the target is a creature, it must succeed on a DC 27 Constitution saving throw or have its hit point maximum reduced by the fire damage taken. The reduction lasts until the creature finishes a long rest. 

Infernal Tail. Melee Weapon Attack: +19 to hit, reach 40 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage plus 14 (4d6) fire damage. The target must succeed on a DC 27 Strength saving throw or be knocked 30 feet away and knocked prone. 

Eldritch Ray. Ranged Spell Attack: +19 to hit, range 300 ft., one target. Hit: 45 (6d10 + 12) force damage plus 18 (4d8) psychic damage. The target must succeed on a DC 27 Intelligence saving throw or be unable to take reactions until the end of its next turn. 

Abyssal Blast. Baaltraxx exhales an infernal blast from his glowing mouth in a 90-foot cone. Each creature in the area must make a DC 27 Dexterity saving throw, taking 72 (16d8) fire damage plus 45 (10d8) necrotic damage on a failed save, or half as much on a successful one. A creature that fails the save is also burning. Until the end of its next turn, it takes 18 (4d8) fire damage at the start of its turn. 

Apocalypse Wing. Baaltraxx beats his colossal wings. Each creature within 40 feet of him must make a DC 27 Strength saving throw. On a failure, a creature takes 35 (5d10 + 8) bludgeoning damage, is knocked prone, and is pushed up to 30 feet. On a success, it takes half damage and isn’t pushed or knocked prone. Baaltraxx can then fly up to half his flying speed. 

Reality Rend (Recharge 5-6). Baaltraxx tears open reality at a point he can see within 120 feet. A 30-foot-radius, 60-foot-high vortex appears there for 1 minute. When it appears, creatures in the area must make a DC 27 Dexterity saving throw, taking 55 (10d10) force damage plus 22 (4d10) necrotic damage on a failure, or half as much on a success. The area becomes difficult terrain. At the start of each of Baaltraxx’s turns, he can move the vortex up to 30 feet. A creature that starts its turn inside the vortex must make a DC 27 Strength saving throw or be pulled 20 feet toward its centre and take 22 (4d10) force damage. 

Call The Horde (1/Day). Baaltraxx summons servants from The Source. He summons either: 

• 2d4 powerful demons, or 

• 1 powerful demon and 2d4 lesser demons. 

The summoned creatures appear in unoccupied spaces within 60 feet and act immediately after Baaltraxx in initiative. The summoned creatures remain for 1 hour, until slain, or until Baaltraxx dismisses them. 

Eldritch Step. Baaltraxx teleports up to 60 feet to an unoccupied space he can see. Each creature within 10 feet of the space he leaves must succeed on a DC 27 Dexterity saving throw or take 14 (4d6) force damage. 

Command The Faithful. One creature within 120 feet that is allied with Baaltraxx can immediately move up to half its speed and make one weapon attack.

Cruel Reversal. When a creature Baaltraxx can see within 120 feet deals damage to him, Baaltraxx reduces the damage by 30. The attacking creature then takes 30 psychic damage and must succeed on a DC 27 Wisdom saving throw or become frightened of Baaltraxx until the end of its next turn. 

No Escape. When a creature within 60 feet teleports or attempts to leave the plane of existence, Baaltraxx can teleport to a space within 10 feet of that creature.

Baaltraxx can take 4 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. 

Move. Baaltraxx moves up to half his speed without provoking opportunity attacks. 

Claw. Baaltraxx makes one Claw attack. 

Eldritch Ray. Baaltraxx makes one Eldritch Ray attack. 

Tail Sweep (Costs 2 Actions). Baaltraxx makes a Tail attack against every creature within 40 feet. 

Abyssal Command (Costs 2 Actions). One creature Baaltraxx can see within 120 feet must succeed on a DC 27 Wisdom saving throw or use its reaction to make one weapon attack against a target Baaltraxx chooses. If the creature has no reaction available, it instead takes 22 (4d10) psychic damage. 

Hellfire Detonation (Costs 3 Actions). Baaltraxx chooses a point within 120 feet. Each creature within 20 feet of that point must make a DC 27 Dexterity saving throw, taking 36 (8d8) fire damage plus 18 (4d8) necrotic damage on a failure, or half as much on a success. 

Tear The Veil (Costs 4 Actions). Baaltraxx creates a 20-foot-radius rift in space at a point within 120 feet. Creatures in the area must succeed on a DC 27 Dexterity saving throw or be teleported to an unoccupied location of Baaltraxx’s choice within 60 feet.

The First Demon Awakens. If Baaltraxx is reduced to 0 hit points, he doesn’t die. Instead, his body collapses into a gigantic black mass of smoke and fire. Every creature within 120 feet must make a DC 28 Wisdom saving throw. On a failure, the creature takes 36 (8d8) psychic damage and becomes frightened for 1 minute. On a success, it takes half damage and isn’t frightened. Baaltraxx then regains 400 hit points, ends all conditions affecting him, and activates the following abilities: 

• His size becomes Gargantuan, if it wasn’t already. 

• His flying speed becomes 180 feet. 

• His melee reach increases by 10 feet. 

• His attacks deal an additional 2d10 necrotic damage. 

• His Eldritch Ray deals an additional 2d10 psychic damage. 

• He gains access to his Mythic Actions. 

• The battlefield begins to transform into an extension of The Source. 

Once this trait activates, Baaltraxx cannot use it again.  

Mythic Encounter XP: Defeating Baaltraxx after this transformation awards an additional 155,000 XP, for a total encounter value of 310,000 XP. 

Mythic Actions 

While The First Demon Awakens is active, Baaltraxx can use the following mythic actions in addition to his normal legendary actions. 

Oblivion Beam (Costs 2 Actions). Baaltraxx fires a beam of primordial Abyssal energy in a 120-foot-long, 15-foot-wide line. Each creature in the line makes a DC 28 Dexterity saving throw, taking 54 (12d8) force damage plus 27 (6d8) necrotic damage on a failure, or half as much on a success. 

Ancient Terror (Costs 2 Actions). Every enemy within 120 feet that can see Baaltraxx must make a DC 28 Wisdom saving throw. On a failure, a creature takes 27 (6d8) psychic damage and becomes frightened for 1 minute. 

A frightened creature can repeat the saving throw at the end of each of its turns. 

Worldbreaker (Costs 3 Actions). Baaltraxx slams both fists into the ground. The ground in a 60-foot radius around him erupts. Creatures in the area must make a DC 28 Dexterity saving throw, taking 45 (10d8) bludgeoning damage plus 36 (8d8) fire damage on a failure, or half as much on a success. The area becomes difficult terrain until the end of the encounter. 

Birth of The Abyss. Baaltraxx opens a massive rift beneath his enemies. Up to six creatures he can see within 120 feet must make a DC 28 Charisma saving throw. On a failure, a creature takes 44 (8d10) force damage and is banished into a nightmare pocket of The Source until the end of its next turn. When it returns, it appears in an unoccupied space chosen by Baaltraxx and takes 22 (4d10) psychic damage.