pf2e.fyi
From Pathfinder Lost Omens The Mwangi Expanse, which isn't enabled.

Mamlambo

CREATURE 9
UNCOMMONHUGEAQUATICBEASTEVIL

Mamlambos are river predators with hypnotic, bioluminescent skin. They appear similar to crocodiles, but the narrow head at the end of their long necks resembles a horse's skull, and their four legs are stubby and inefficient for land movement. Their skin's green glow is only barely visible in daylight or when underwater, though the glow is difficult to resist. As a result, they're frequently trailed by fish, birds, or other river creatures ensnared by the alluring radiance.

Humanoids are mamlambos' favorite prey, particularly humans, although they strangely prefer to only eat their victims' faces and brains. Mamlambos are dim-witted but sly, and sometimes hide their victims under submerged rocks or logs to make their discovery less likely. A mamlambo might be active in a region for days or even weeks before its presence is discovered.

Perception +19; darkvision
Skills Athletics +21, Stealth +19, Survival +17 (+19 to Track)
Str +7, Dex +4, Con +5, Int -3, Wis +4, Cha +0
AC 28; Fort +19, Ref +20, Will +15
HP 155
Attack of Opportunity (Tail Only)

Tail only

Trigger A creature within the monster's reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using.
Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and the trigger was a manipulate action, the monster disrupts that action. This Strike doesn't count toward the monster's multiple attack penalty, and its multiple attack penalty doesn't apply to this Strike.

Luminous Lure (aura, emotion, incapacitation, light, mental, primal)

30 feet. The mamlambo emits dim light from its skin. A creature that enters or begins its turn in the aura must attempt a DC 23 Will save. Humanoids take a -2 penalty to this saving throw.

Regardless of the save's result, the creature is temporarily immune for 10 minutes.

Critical Success The creature is unaffected.

Success The creature is Slowed 1 for 1 round.

Failure The creature is Fascinated, and for as long as it is in the aura it must spend at least 1 of its actions on each of its turns to move closer to the mamlambo as expediently as possible, while avoiding obvious dangers. If the creature ends its movement or turn adjacent to the mamlambo, it is Slowed 1 until it is out of the aura or until the mamlambo makes a Strike against it.

The target can attempt a new Will save at the beginning of each of their subsequent turns, and on a success, the effect ends.

Critical Failure As failure, but the creature must spend each of its actions moving closer to the mamlambo, and if it ends its movement or turn adjacent to the mamlambo, it is Paralyzed until it is out of the aura or until the mamlambo makes a Strike against it.

Speed 10 feet, swim 40 feet
Melee Jaws +21 (reach 10, unarmed), Damage 2d8+11 piercing plus Improved Grab
Melee Tail +21 (agile, reach 15), Damage 2d6+11 bludgeoning
Aquatic Ambush

50 feet

Requirements The monster is hiding in water and a creature that hasn't detected it is within the listed number of feet.
Effect The monster moves up to its swim Speed + 10 feet toward the triggering creature, traveling on water and on land. Once the creature is in reach, the monster makes a Strike against it. The creature is Off-Guard against this Strike.

Face Eater
Requirements The mamlambo has a creature Grabbed or Restrained, or there is a Dying, Immobilized, or Unconscious creature within the mamlambo's reach
Effect The mamlambo deals 2d8+11 piercing damage to the creature (DC 28 basic Fortitude save).

On a failure, the creature also takes an additional 2d6 bleed, or 4d6 bleed on a critical failure.

Improved Grab

Trigger The monster's last action was a successful Strike that lists Improved Grab in its damage entry, or the monster has a creature Grabbed or Restrained
Effect If used after a Strike, the monster attempts to Grapple the creature using the body part it attacked with as a free action. This attempt neither applies nor counts toward the creature's multiple attack penalty.

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.

Pathfinder Lost Omens The Mwangi ExpanseOGL