How about time for the option in Pathfinder!
This options simulates taking massive damage to the point a creature is knocked unconscious. When a creature takes at least 50% of its maximum hit points in damage between the start of its turn to the start of its next turn, divine the amount of damage takes by its max hit point. Multiply that by 20 and round to the nearest whole number, rounded down. At the start of the its turn, the creature must make a flat d20 roll with the DC equal to the calculated value. 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.