After triggering your third Protection Hit, Mettle of Man activates:

While injured, Mettle of Man shields you from going down the next time you take damage.
Healing back to full health will reveal your Aura to the Killer whenever you are farther than 12/14/16 metres from them.
Mettle of Man deactivates the next time you are put into the Dying State.

Increases the odds of becoming the Killers initial Obsession by +100 percent.

The Killer can only be obsessed with Survivor at a time.

Grants 3 additional Self-Unhook attempts.
Increases the Self-Unhook chance by 2/3/4 percent.

Whenever another Survivor finishes healing you, Teamwork: Collective Stealth activates and both you and the Survivor who healed you benefit from the following effect:

Suppresses your Scratch Marks for as long as you stay within 12 metres of one another or one of you loses a Health State.
Teamwork: Collective Stealth has a cool-down of 180/160/140 seconds.

Survivors can only be affected by one instance of Teamwork: Collective Stealth at a time.

You suffer from the Broken Status Effect for the entire Trial, but benefit from the following effects:

Pools of Blood are suppressed.
When injured or dying, Grunts of Pain are reduced by 25/50/75 percent.
Your Recovery speed is increased by 15/20/25 percent.
You can recover fully from the Dying State.

While repairing Generators, complete 5/4/3 Good or Great Skill Checks to activate Rookie Spirit for the remainder of the Trial:

Once active, the Auras of any regressing Generators are revealed to you.

Unlocks potential in your Aura-reading ability:
The Auras of Survivors in the Injured State or in the Dying State within 64/96/128 metres of your location are revealed to you.
Empathy does not reveal the Aura of a Survivor being carried by the Killer.