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.

Your presence psychically projects itself to those in danger.
Whenever another Survivor is injured, they can see your Aura when within 32/64/96 metres of your location.
You heal other Survivors 10 percent faster.

You start the Trial with a Progression penalty of -25 percent for succeeding a Good Skill Check while healing another Survivor.
Succeeding a Good Skill Check while healing another Survivor grants 1 Token, up to a maximum of 3/4/5 Tokens.
Each Token grants a stack-able Progression bonus of +15 percent for succeeding a Good Skill Check while healing another Survivor.
Suppresses Great Skill Checks while healing another Survivor.
Autodidact remains inactive while healing another Survivor using a Med-Kit.

After being unhooked or unhooking yourself, Off the Record activates for the next 60/70/80 seconds:

Prevents your Aura from being revealed to the Killer, if they attempt to read it.
Suppresses Grunts of Pain when injured.
Grants the Endurance Status Effect.
This effect is cancelled prematurely if you perform a Conspicuous Action.
Off the Record deactivates once the Exit Gates are powered.

Increases your Recovery rate from the Blindness, Broken, Exhaustion, Exposed, Haemorrhage, Hindered, and Oblivious Status Effects by 20/25/30 percent.
This effect also applies to all other Survivors within 8 metres of your location and lingers for 15 seconds.

Once per Trial, you can completely recover from the Dying State.

Your Recovery speed is increased by 25/30/35 percent.