Ok, time for Starfinder!
How about time for the option in Pathfinder!
System Shock
This options simulates taking massive damage to the point a creature is knocked unconscious. When a creature takes at least 50% of its maximum stamina points in damage between the start of its turn to the start of its next turn, it may be knocked unconscious. If the creature only has hit points, use that instead. At the start of the its turn, the creature must make a flat d20 roll (11 DC). On a failure, the creature fall unconscious As an action, another creature can rouse the target back to conscious. Any additional damage also wakes the target up. Creatures immune to unconscious condition can not be subjected to shock. If the damage equals the creature’s maximum stamina points, the DC is 14.
Thoughts?
Throat Punch Games 