Ixirizmid
CREATURE 8Tremorsense 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.
Ixirizmid can use Deception to impersonate any Medium humanoid creature, although creating such a disguise takes 1 hour. They can't impersonate a specific individual with this ability.
Ixirizmid doesn't breathe and is immune to effects that require breathing (such as an inhaled poison).
Ixirizmid performs a swift and painful surgery on a creature it has grabbed or restrained, or who's otherwise immobilized. They roll a Medicine check against the target's Fortitude DC. Regardless of the result, the target then becomes temporarily immune to Eviscerate for 24 hours.
Critical Success The target takes 8d6 slashing damage, is Slowed 1 for 1 round, and becomes Clumsy 1, Enfeebled 1, or Stupefied 1 (the mi-go chooses) for 24 hours.
Success The target takes 5d6 slashing damage and is Slowed 1 for 1 round by the pain.
Failure The target takes 3d6 slashing damage.
Critical Failure The target takes no damage.
Ixirizmid deals an additional 1d6 precision damage to Off-Guard creatures.
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.