Critically Wounded

Creature is critically wounded if its HP is reduced to 0.
Critically wounded creature is knocked prone and cannot stand up.
Critically wounded creature's normal moving speed, if it has one, becomes 1 m and all other speeds become 0 m.
Critically wounded creature cannot use Reposition action.
Creature only gains ◆ at the beginning of each of its turns.
If critically wounded creature doesn't receive healing it dies at the end of its 3rd turn after becoming critically wounded.
If creature takes any damage while being critically wounded it dies one turn earlier.
If a critically wounded creature regains life while critically wounded it is no longer critically wounded but receives one level of system stress.