Fear Aura. Any creature hostile to Berylis that starts its turn within 30 feet of Berylis must make a DC 25 Wisdom saving throw, unless Berylis is incapacitated. On a failed save, the creature is frightened until the start of its next turn. If a creature's saving throw is successful, the creature is immune to Berylis' Fear Aura for the next 24 hours.
Magic Resistance. Berylis has advantage on saving throws against spells and other magical effects.
Magic Weapons. Berylis' weapon attacks are magical.
Turn Immunity. Berylis automatically succeeds on saving throws against any effect that turns undead.
Legendary Resistance (3/Day). If Berylis fails a saving throw, it can choose to succeed instead.
Divine Awarness. Berylis knows if it hears a lie.
Innate Spellcasting. Berylis' spellcasting ability is Intelligence (spell save DC 25, +15 to hit with spell attacks). Berylis can innately cast the following spells, requiring no material components:
At will: hold person, chill touch, ray of enfeeblement, animate dead, bestow curse, command
3/day each: blight, create undead, hold monster, vampiric touch, contagion, geas
1/day each: finger of death, power word kill, feeblemind
Multiattack. Berylis makes two attacks with its Morningstar of Tyranny.
Morningstar of Tyranny. Melee Weapon Attack: +20 to hit, reach 10 ft., one target. Hit: 20 (3d6 + 10) bludgeoning damage plus 28 (8d6) necrotic damage, and the target must make a DC 20 Wisdom saving throw or be prone for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Breath of Pestilence (Recharge 5-6). Berylis exhales poisonous gas in a 90--foot cone. Each creature in that area must make a DC 25 Constitution saving throw, taking 87 (25d6) poison damage on a failed save, or half as much damage on a successful one.
A humanoid slain by this attack rises 12 hours later as a zombie under Berylis' control, unless the humanoid is restored to life or its body is destroyed.
Berylis 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. Berylis regains spent legendary actions at the start of its turn.
Enforce Tyranny. Berylis makes one attack with its Morningstar of Tyranny.
Words of Suppression (Costs 2 Actions). Berylis utters an ancient command. Each non-undead creature within 15 feet of Berylis must succed on a DC 20 Constitution saving throw or be stunned until the beginning of Berylis' next turn.
Words of Brutality (Costs 2 Actions). Berylis utters an ancient command. Non-undead creatures within 60 feet of Berylis, including ones behind barriers and around corners, can't regain hit points until the beginning of Berylis' next turn.
Words of Oppression (Costs 3 Actions). Berylis utters an ancient command. Each non-undead creature within 30 feet of Berylis must make a DC 20 Constitution saving throw against this magic, taking 21(8d6) necrotic damage on a failed save, or half as much damage on a successful one.