When a PC drops to 0 hit points they're considered "Broken" until they regain any hit points. The PC is immediately knocked prone and gains one level of exhaustion. They do not fall unconscious or roll death saves, and they can still act normally on their turn.

When a broken PC takes damage they gain one "Brush with Death" and mark it as you would with a failed death saving throw. Once a PC has accumulated three brushes with death, they die.

When a broken PC is critically hit, they only accumulate one brush with death, but they also roll on the injury table.

Saving throws and broken PCs : If a broken PC is forced to make a saving throw in order to halve the damage they take, one of two things will happen depending on whether they succeed or fail. The PC succeeds. They still gain one brush with death, as per rule 2.

The PC fails. They gain one brush with death and additionally they gain one level of exhaustion.