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.

After performing a rushed vault in a Chase, Cut Loose activates for the next 4/5/6 seconds:

Suppresses both the Loud Noise Notification and the sound effects triggered by rushing to vault.
Successfully performing a rushed vault while Cut Loose is active resets the timer.
Cut Loose has a cool-down of 45 seconds.

Survivors you unhook benefit from the following effects:

Extends the duration of their Endurance Status Effect by 6/8/10 seconds.
Extends the duration of their Haste Status Effect by 10 seconds.

After repairing Generators for a total of 70/60/50 percent, Flashbang activates:

Enter a Locker while empty-handed and press the Ability button to craft a Flash Grenade.
The Flashbang is left behind when escaping the Trial.

When within 6 metres of a hooked Survivor, press the Active Ability button to halt their Sacrifice Process for the next 20/25/30 seconds.
If the hooked Survivor has already entered the Struggle Phase, its Skill Checks are paused for that duration.
Reassurance can only be used once per Survivor per Hook Instance.

Interacting with a Locker while holding the Sprint button has the following effects:

You do not enter the Locker.
The Locker's doors swing open and close swiftly, feigning a Survivor entering it.
Triggers a Loud Noise Notification at the Locker's location, feigning a Survivor rushing to enter it.
Suppresses the creation of Scratch Marks and Pools of Blood for 3 seconds.
Deception has a cool-down of 60/50/40 seconds.