Converting the 3rd edition OA monsters as there are a many new monsters in this book that were not in 1e.  Converting them here.  

This is actually the Pathfinder version as it is a bad-guy in the Jade Regent AP. Original was only CR 2. 


Medium humanoid (yuan-ti), neutral evil

Armor Class 16 (Natural Armor)

Hit Points 144 (17d8 + 68)
Speed 30 ft.
STR      DEX       CON      INT       WIS      CHA
18 (+4) 18 (+4) 18 (+4) 17 (+3) 15 (+2) 18 (+4)
Saving Throws DEX +9, WIS +7, CHA +9
Skills Perception +7, Stealth +9
Damage Resistances Necrotic; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Senses Darkvision 120 ft., Passive Perception 17
Languages Common. Yuan-Ti
Challenge 15 (13,000 XP)

Elongate Neck. A rokurokubi can stretch her neck from a normal human length up to 20 feet. While her neck is retracted she looks human.

Magic Resistance. The rokurokubi has advantage on saving throws against spells and other magical effects.

No Sleep. A rokurokubi does not need to sleep and is immune to all sleep effects.

Nightfall Aura. A rokurokubi can create an aura of darkness and silence (as the spells) with a radius of 15 feet. The rokurokubi is immune to the effects of her aura, and can activate or suppress this ability as a free action. These aura effects can be dispelled as if they were spells.

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

Innate Spellcasting. The rokurokubi’s spellcasting ability is Charisma (spell save DC 12). The rokurokubi can innately cast the following spells, requiring no material components:

Spellcasting. The rokurokubi is a 9th-level spellcaster. Her spellcasting ability is Intelligence (spell save DC 16, +8 to hit with spell attacks). The rokurokubi has the following wu-jen spells prepared:


Multiattack. The rokurokubi makes two attacks, only one of which can be a bite attack.

Katana. Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 8 (1d8 + 4) slashing damage. Instead of dealing damage, the vampire can grapple the target (escape DC 18).

Bite. Melee Weapon Attack:+9 to hit, reach 20 ft., one creature. Hit: 7 (1d6 + 4) piercing damage plus 10 (3d6) necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the vampire regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. The target must make a DC 17 Charisma saving throw or become cursed.  While cursed the target is silenced (as the spell) and looses 1 Charisma point per day until they make a successful saving throw. The curse lasts until ended with a remove curse spell, or similar magic.  Charisma damage heals 1 point per day after the curse is lifted but the target remains silenced until all Charisma damage is fully healed. A creature reduced to 0 Charisma becomes unconscious until the curse is lifted or starves to death.

Constrict. Melee Weapon Attack: +9 to hit, reach 20 ft., one creature. Hit: 13 (2d8 + 4) bludgeoning damage, and the target is grappled (escape DC 18). Until this grapple ends, the creature is restrained, and the rokurokubi can’t constrict another target. While grappled the target automatically takes 13 (2d8 + 4) bludgeoning damage at the start of its turn.


The rokurokubi 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. The rokurokubi regains spent legendary actions at the start of its turn.

Move. The rokurokubi moves up to its speed without provoking opportunity attacks.

Constrict. The rokurokubi makes one unarmed strike.

Bite.(Costs 2 Actions). The rokurokubi makes one bite attack.


This human-sized woman is dressed in simple peasant clothing. From her shoulders sprouts a grotesquely long neck that coils about like a snake, and razor-sharp teeth fill her gaping maw.

Rokurokubi are sly and cunning, and delight in causing suf- fering. They sometimes befriend a group of travelers or a peas- ant family, only to slay them one at a time in secret. They com- monly disguise themselves as travelers and attack other travelers they meet on the road.

Like a number of other monsters — the hannya, the naga, and the hebi-no-onna — the rokurokubi combines features of a serpent with human appearance. The rokuro-kubi’s only snake- like feature, though, is its long neck, which it can coil around an opponent to squeeze or strangle him to death. Under most circumstances, rokurokubi are indistinguishable from humans, and they take pains to maintain the illusion of humanity. They typically dress in fine clothes, or else the humble garments of a pilgrim or other traveler. The illusion is quickly shattered when a rokurokubi attacks its chosen victim, as it stretches its neck like a huge snake, to a length of up to 20 feet. A rokurokubi’s mouth is filled with sharp fangs. Rokurokubi speak Common and Yuan-Ti.


Banner Credit: “Rokurokubi” by Patryk Jedraszek.