When you unhook a Survivor, the rescued Survivor benefits from the following effects for 4/6/8 seconds:

Scratch Marks and Pools of Blood are suppressed.
Additional 7 percent Haste Status Effect, boosting their Movement speed.
Guardian reveals the Killers Aura to you for 8 seconds.

Start the Trial with 3 Tokens:

When a Chest has already been opened, consume 1 Token to rummage through it for an Item.
Rummage through Chests 40/60/80 percent faster.
Rummaging is only available once per Chest.

You start the Trial with 1/2/3 Token(s) and gain a Token each time you succeed at a Great Skill Check, up to a maximum of 5 Tokens.

Each time another Survivor cooperating with you fails a Skill Check, Corrective Action consumes 1 Token, transforming their Failed Skill Check into Good Skill Check instead.
Corrective Action only applies to normal Skill Checks.

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.

Increases your Healing speed by 100 percent when healing a dying Survivor.
When performing any of the following actions, Were Gonna Live Forever gains 1 Token:

Performing a Safe Hook Rescue
Taking a Protection Hit for an injured Survivor.
Stunning or Blinding the Killer to rescue a carried Survivor
Consume 1 Token to grant the Endurance Status Effect for 6/8/10 seconds to any Survivor healed from the Dying State

Unlocks potential in your Aura-reading ability.
When healing another Survivor from the Dying State to the Injured State, they are granted a 10 percent Haste Status Effect for 6/8/10 seconds and the Killer's Aura is revealed to the both of you for the same duration.