Fernitha

Medium Fiend (Devil), Lawful Evil

AC: 18

Initiative: +3 (13)

HP: 153 (18d8 + 72)

Speed: 30 ft., fly 60 ft.

STR: 18 (+4)
DEX: 16 (+3)
CON: 18 (+4)
INT: 14 (+2)
WIS: 14 (+2)
CHA: 18 (+4)

Saving Throws: Dex +7, Con +8, Wis +6, Cha +8

Resistances: cold; bludgeoning, piercing, slashing from nonmagical attacks that aren't silvered

Immunities: fire; poison

Condition Immunities: poisoned

Senses: truesight 120 ft., Passive Perception 12

Languages: Infernal, telepathy 120 ft.

CR: 12 (XP 8,400; PB +4)

Hellish Weapons.

Fernitha's weapon attacks are magical and deal an extra 13 (3d8) poison damage on a hit (included in the attacks).

Magic Resistance.

Fernitha has advantage on saving throws against spells and other magical effects.

Actions

Multiattack.

Fernitha makes three attacks.

Longsword.

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage, or 9 (1d10 + 4) slashing damage if used with two hands, plus 13 (3d8) poison damage.

Longbow.

Ranged Weapon Attack: +7 to hit, range 150/600 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 13 (3d8) poison damage, and the target must succeed on a DC 14 Constitution saving throw or be poisoned. The poison lasts until it is removed by the lesser restoration spell or similar magic.

Reactions

Parry.

Fernitha adds 4 to its AC against one melee attack that would hit it. To do so, the erinyes must see the attacker and be wielding a melee weapon.

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Source: Vecna: Eve of Ruin, p. 53 - Licenses and attribution