pf2e.fyi
From Pathfinder #179: Cradle of Quartz, which isn't enabled.

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CREATURE 7

Genderless alien entity of unknown provenance

Perception +19; darkvision, tremorsense (imprecise) 30 feet
Languages Common, Kholo, Osiriani; can't speak any language; telepathy 100 feet
Skills Arcana +16, Athletics +16, Diplomacy +14, Spellscar Lore +19, Thievery +16
Str +4, Dex +1, Con +2, Int +4, Wis +2, Cha +1
Tremorsense (Imprecise) 30 feet

Tremorsense allows a monster to feel the vibrations through a solid surface caused by movement. It is an imprecise sense with a limited range (listed in the ability). Tremorsense functions only if the monster is on the same surface as the subject, and only if the subject is moving along (or burrowing through) the surface.

Telepathy 100 feet (aura, magical)

A monster with telepathy can communicate mentally with any creatures within the listed radius, as long as they share a language. This doesn't give any special access to their thoughts, and communicates no more information than normal speech would.


AC 25; Fort +14, Ref +12, Will +14
HP 110; Resistances bludgeoning 10

Speed 25 feet, burrow 25 feet
Melee Arm +16 (agile, reach 10), Damage 2d8+6 bludgeoning plus Grab
Melee Beak +16 (unarmed), Damage 2d8+6 piercing plus I Venom
Primal Innate Spells DC 25, attack +17; 3rd Shifting Sand, Noxious Vapors; 1st Shockwave (At Will)
Constrict

1d8+8 bludgeoning, DC 22 basic Fortitude


Note: A DC was not provided for this ability by Paizo. The DC present here is a moderate DC for the creature level according to the Gamemastery Guide creature building Tables.


The monster deals the listed amount of damage to any number of creatures Grabbed or Restrained by it. Each of those creatures can attempt a basic Fortitude save with the listed DC.

I Venom (poison)
Saving Throw DC 25 Fortitude

Maximum Duration 6 rounds
Stage 1 2d6 poison damage and Enfeebled 1 (1 round)
Stage 2 2d6 poison damage, enfeebled 1, and Off-Guard (1 round)
Stage 3 2d6 poison damage, Enfeebled 2, and off-guard (1 round)
Writhing Arms

I makes up to four Strikes with different arms, each against a different target. Each attack counts separately for their multiple attack penalty, but the penalty doesn't increase until all attacks have been made. If I subsequently uses the Grab action, they can Grab any number of creatures they hit with Writhing Arms.

Grab

Requirements The monster's last action was a successful Strike that lists 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. This attempt neither applies nor counts toward the creature's multiple attack penalty.

The monster can instead use Grab and choose one creature it's grabbing or restraining with an appendage that has Grab to automatically extend that condition to the end of the monster's next turn.

Pathfinder #179: Cradle of QuartzOGL