Each time a Survivor other than yourself is killed or sacrificed, Sole Survivor gains 1 Token, up to a maximum of 3 Tokens:

Each Token grants a stack-able radius of 20/22/24 metres within which the Killer is unable to read your Aura, up to a maximum of 60/66/72 metres.
Once you are the last Survivor standing, you benefit from the following effects:

Increases your Repair speed of Generators by +75 percent.
Increases your Opening speed of the Exit Gates and the Hatch by +50 percent.
Increases the odds of becoming the Killers initial Obsession by +100 percent.

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

You refuse to fail, even during your darkest hour.
Increases your Action speeds in Healing and Unhooking by 10/12/14 percent for each injured, hooked, or dying Survivor, up to a maximum of 40/48/56 percent.

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.

When healing yourself or another Survivor, Grunts of Pain and all noises related to the Healing action are suppressed:

Failed Healing Skill Checks do not trigger a Loud Noise Notification and only apply a Regression penalty of 3/2/1 percent.

Suppresses both the Loud Noise Notification and the sound effects triggered by rushing to vault Windows, Pallets, or rushing to enter or exit Lockers.
Quick & Quiet has a cool-down of 30/25/20 seconds.

After repairing Generators for a total of 12/10/8 uninterrupted seconds, press the Active Ability button to activate Potential Energy:

Continuing to repair the Generator will charge Potential Energy instead of progressing the Generator.
Converts 1.5 percent of Repair progression into 1 Token, up to a maximum of 20 Tokens.
Missing Skill Checks results in losing some Tokens.
While Potential Energy has at least 1 Token, press the Active Ability button while repairing a Generator to instantly progress it by 1 percent per Token, consuming all remaining Tokens and deactivating Potential Energy.

Potential Energy loses all Tokens and deactivates upon losing a Health State.