A cobbled brutalizer's tremorsense is a precise sense out to 40 feet and an imprecise sense out to 80 feet. A cobbled brutalizer can't sense anything beyond the range of its tremorsense.
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.
Trigger The cobbled bruiser is reduced to 0 Hit Points
Effect A Cobbleswarm spawns in the space the cobbled bruiser previously occupied, or the nearest adjacent space if there is already a cobbleswarm occupying that space.
Cobbleswarm Bond
The cobbled brutalizer is immune to damage dealt by allied cobbleswarms.
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.
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 Society Scenario #3-16: Escape from OpparaOGL