Creature Abilities
Source Alien Core pg. 208
The following creature abilities are listed here because they are shared by many creatures or are highly complex. The statistics for individual creatures might alter the traits, the number of actions, or other rules of these abilities. Anything noted in a specific creature's stat block overrides the general rules for the ability below. In these abilities, “monster” is used for the creature that has the ability, to differentiate it from any other creatures the ability might affect.
Greater Constrict [one-action]
Source Alien Core pg. 209
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. A creature that fails this save falls unconscious, and a creature that succeeds is then temporarily immune to falling unconscious from Greater Constrict for 1 minute.