Once the Exit Gates are powered, No One Left Behind activates:

Increases your Unhooking and Healing speed by 30/40/50 percent.
Grants 50/75/100 percent bonus Bloodpoints for actions in the Altruism Category.
Grants the unhooked Survivor a 7 percent Haste Status Effect for 10 seconds.
The Auras of all other Survivors are revealed to you.

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.

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

When you or the Obsession are injured, you both see each other's Auras.

After healing the Obsession or being healed by the Obsession, you both gain the Haste Status Effect, moving at an increased speed of 5/6/7 percent until you are no longer within 16 metres of each other.
If you are the Obsession, Blood Pact deactivates.
Lowers the odds of becoming the Killer's initial Obsession by -100 percent.

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

Unlocks potential in your Aura-reading ability.
Each time a Generator is completed, the Auras of any Generators, Chests, and Totems within 32/48/64 metres are revealed to you for 10 seconds.

If you are holding a Map, any objects revealed by Detectives Hunch will automatically be tracked by it.

Whenever you cleanse a Totem, Clairvoyance activates:

When empty-handed, press and hold the Ability button to unlock your full Aura-reading potential, allowing you to see the Auras of the Exit Gate Switches, Generators, Hooks, Chests, and the Hatch within 64 metres for 8/9/10 seconds.