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.

While you are on the Hook in the Struggle Phase, Kinship activates:

If another Survivor is within 16 metres of your Hook while Kinship is active, the Struggle Phase timer is paused for 26/30/34 seconds.

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

Press and hold the Active Ability button for 6/5/4 seconds while standing beside a dropped Pallet to reset it to its upright position.

Grants the ability to see the Auras of all dropped but not yet destroyed Pallets in the environment.

In your countless years in The Fog, you have seen it all, and when you are focused, you can remember most of it too. Succeeding a Great Skill Check while repairing a Generator reveals the Killers Aura to you for 4/5/6 seconds.

While being carried by the Killer, the following effects apply:

Increases the intensity of the Struggle Effects on the Killer from your Wiggling by 60/70/80 percent.
Obscures the Auras of all Hooks from the Killer's Aura-reading abilities within 16 meters.
Fills your Wiggle Meter by 33 percent of your current Wiggle progression upon landing, when the Killer drops from great heights.