Orochi
CREATURE 18An orochi is an enormous serpent with eight heads and eight tails that lives among large waterways. Orochi are vile, amoral creatures kept at bay only with yearly sacrifices. Most settlements unable to satisfy an orochi with a sacrifice soon meet their destruction.
A creature can attempt to sever one of the orochi's eight heads by specifically targeting it and dealing damage equal to the head's HP. A head not completely severed returns to full HP at the end of the attacking creature's turn. An orochi that loses all of their heads immediately dies.
This monster can see in all directions simultaneously and therefore can't be flanked.
60 feet. DC 37 Will
A creature that first enters the area must attempt a Will save.
Regardless of the result of the saving throw, the creature is temporarily immune to this monster's Frightful Presence for 1 minute.
Critical Success The creature is unaffected by the presence.
Success The creature is Frightened 1.
Failure The creature is Frightened 2.
Critical Failure The creature is Frightened 4.
HP 60, multiple heads
Immunities area damage
Weaknesses cold iron 15
Resistances poison 15
The orochi gains an extra reaction per round for each of their heads that remains beyond the first, which it can use only to make Attacks of Opportunity. They can't use more than 1 reaction on the same triggering action, and the orochi must use a different head for each Attack of Opportunity.
The orochi makes a number of jaws Strikes equal to the number of their remaining heads, each against a different target. The orochi's multiple attack penalty doesn't increase until after the orochi makes all of their attacks.
Huge, 2d12+18 bludgeoning damage, Rupture 40
The monster attempts to swallow a creature of the listed size or smaller that it has grabbed or restrained in its jaws or mouth. If a swallowed creature is of the maximum size listed, the monster can't use Swallow Whole again. If the creature is smaller than the maximum, the monster can usually swallow more creatures; the GM determines the maximum. The monster attempts an Athletics check opposed by the grabbed creature's Reflex DC. If it succeeds, it swallows the creature. The monster's mouth or jaws no longer grab a creature it has swallowed, so the monster is free to use them to Strike or Grab once again. The monster can't attack creatures it has swallowed.
A swallowed creature is Grabbed, is Slowed 1, and has to hold its breath or start suffocating. The swallowed creature takes the listed amount of damage when first swallowed and at the end of each of its turns while it's swallowed. If the victim Escapes this ability's grabbed condition, it exits through the monster's mouth. This frees any other creature grabbed in the monster's mouth or jaws. A swallowed creature can attack the monster that has swallowed it, but only with unarmed attacks or with weapons of light Bulk or less. The swallowing creature is Off-Guard against the attack. If the monster takes piercing or slashing damage equaling or exceeding the listed Rupture value from a single attack or spell, the swallowed creature cuts itself free. A creature that gets free by either Escaping or cutting itself free can immediately breathe and exits the swallowing monster's space.
Effect: Engulf and Swallow Whole
If the monster dies, a swallowed creature can be freed by creatures adjacent to the corpse if they spend a combined total of 3 actions cutting the monster open with a weapon or unarmed attack that deals piercing or slashing damage.
The monster can instead use Improved Grab as an action and choose one creature it's grabbing or restraining with an appendage that has Improved Grab to automatically extend that condition to the end of the monster's next turn.