Huge Fiend (Demon), Lawful Evil

Challenge Rating: 22 (41,000 XP)

Armor Class 21 (natural armor)
Hit Points 490 (35d12 + 280)
Speed 40 ft., burrow 20 ft., climb 30 ft.

Saving Throws Dex +10, Con +15, Wis +11, Cha +14
Skills Deception +14, Insight +11, Intimidation +14, Persuasion +14
Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities charmed, frightened, poisoned
Senses truesight 120 ft., passive Perception 14
Languages Abyssal, Infernal, telepathy 120 ft.
Proficiency Bonus +7

Traits

Sin Incarnate. While the Harbinger is on the same plane as any sentient creature, its aura of temptation weakens resolve. Creatures within 60 ft. of the Harbinger must make a DC 21 Wisdom saving throw at the start of their turn or suffer disadvantage on saving throws against charm and fear effects until the start of their next turn.

Aura of Submission. Any creature that starts its turn within 30 ft. of the Harbinger must succeed on a DC 21 Charisma saving throw or be charmed for 1 minute. Charmed targets view the Harbinger as an irresistible authority. The effect ends early if the Harbinger or its allies damage the target.

Stain of Sin (Soul Shard). The Harbinger contains the corrupted soul-essence of Azmodan. While the Harbinger lives, all demons within 300 feet are under the effects of bless and gain temporary hit points equal to their CR at the start of their turn.

Legendary Resistance (3/Day). If the Harbinger fails a saving throw, it can choose to succeed instead.

Actions

Multiattack. The Harbinger makes three attacks: one with its Claw, one with its Trampling Fist, and one with Lash of Sin.

Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target.
Hit: 21 (3d8 + 8) slashing damage plus 14 (4d6) necrotic damage.

Trampling Fist. Melee Weapon Attack: +15 to hit, reach 10 ft., one target.
Hit: 27 (4d10 + 8) bludgeoning damage and the target must make a DC 20 Strength saving throw or be knocked prone and restrained by chitinous sinew (escape DC 20).

Lash of Sin. Melee Weapon Attack: +15 to hit, reach 20 ft., one target.
Hit: 19 (3d6 + 8) piercing damage and the target is dragged 15 ft. closer to the Harbinger.

Call of Vice (Recharge 5–6). The Harbinger conjures a wave of tempting illusions. Each creature of its choice in a 60-ft. cone must make a DC 21 Wisdom saving throw or be incapacitated for 1 minute, overwhelmed by visions of indulgence. Targets may repeat the save at the end of their turn, ending the effect on a success.

Legendary Actions

The Harbinger can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature’s turn. The Harbinger regains spent legendary actions at the start of its turn.

• Sinful Echo. Forces a creature within 60 feet to repeat the last saving throw it made (no reaction).
• Shadow Lash. Makes a Lash of Sin attack.
• Dominate Weak (Costs 2 Actions). Casts dominate monster (1 target, no concentration, 1 minute duration). Recharge on a 6 after use.

Lair Actions (The Crucible of Sin)

When in its lair, Azmodan’s Harbinger can invoke the following effects on initiative count 20 (losing initiative ties):

• Sin Fog. A 40-foot radius of infernal fog spreads out. All creatures within the area must make a DC 18 Charisma save or be blinded and charmed until the end of their next turn.
• Summon Sinners. Two CR 5 fiends emerge from sin-rifts.
• Chains of Regret. Up to 3 creatures the Harbinger can see must succeed a DC 21 Strength save or be restrained by ghostly chains of sin until the start of the next round.

Death Throes

When the Harbinger dies, the Stain of Sin explodes, forcing all creatures within 60 feet to make a DC 21 Constitution saving throw, taking 55 (10d10) necrotic damage on a failed save, or half as much on a successful one. A black shard remains behind, pulsing with Azmodan’s essence.

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