The Peryton's Horrific Critical ability states:
A peryton’s gore attack threatens a critical hit on an 18–20. If a peryton kills a humanoid foe with a critical hit, it can tear out the victim’s heart with its wolf-like teeth as a free action. Any creature that witnesses this savage event must make a DC 13 Fortitude save or be shaken for 1 round. This is a mind-affecting fear effect. The save DC is Charisma-based.
Does only trigger if the player's HP drops below 0 a total equal to their constitution score, meaning dead-dead? Or, if they drop below 0, does it trigger, effectively being an insta-kill?
thanks!