Traits
Hellish Weapons: Basically, the Erinyes Monster weapon attacks were magical and also deal an extra 13 (3d8) poison damage on a specific hit (included in the attacks).
Magic Resistance: The erinyes has the advantage on saving throws which against spells and even other magical effects too.
Actions
Multiattack: The erinyes 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 it 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 even the target must succeed on a DC 14 Constitution saving throw or be Poisoned. The poison will last until it is removed by the Lesser Restoration spell or similar magic.
Reactions
Parry: This erinyes will add 4 to its AC against one melee attack which would be hit it. But to do so, the erinyes should be seen the attacker and be wielding a melee weapon.
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Attributes Of Erinyes Monster
| AC | 18 (Plate) | 
| Alignment | Lawful Evil | 
| CHA | 18 | 
| CON | 18 | 
| Challenge Rating | 12 | 
| Condition Immunities | Poisoned | 
| DEX | 16 | 
| HP | 153 (18d8+72) | 
| INT | 14 | 
| Immunities | Fire, Poison | 
| Languages | Infernal, Telepathy 120 Ft. | 
| Passive Perception | 12 | 
| Resistances | Cold; Bludgeoning, Piercing, And Slashing From Nonmagical Attacks That Aren’t Silvered | 
| Roll 0 | One Handed 1d20 + 8 1d8+4+3d8 | 
| Roll 1 | Two Handed 1d20 + 8 1d10+4+3d8 | 
| Roll 2 | Longbow 1d20 + 7 1d8+3+3d8 | 
| STR | 18 | 
| Saving Throws | Dex +7, Con +8, Wis +6, Cha +8 | 
| Senses | Truesight 120 Ft. | 
| Size | Medium | 
| Speed | 30 ft., fly 60 ft. | 
| Type | fiend (devil) | 
| WIS | 14 |