Each time a Survivor is hooked for the first time, you gain a token.  Upon reaching 4 tokens Grim Embrace activates.

The Entity blocks all generators for 40 seconds.  The Obsessions aura is revealed to you for 5 seconds.

After a generator is repaired, The Entity blocked the generator with the most progress for 30 seconds.  You see its white aura during this time.

Once the Exit Gates are powered, Terminus activates:

All Survivors, who are either injured, dying, or hooked, suffer from the Broken Status Effect until the Exit Gates are opened.
This effect lingers for an additional 20/25/30 seconds after the Exit Gates are open.

Unlocks potential in ones aura reading ability.  Each time a generator is fully repaired, Survivors within 16 meters of the completed generator will be revealed for 5 seconds.  When the last generator is fully repaired, all the survivors auras are revealed for 10 seconds.

Crows startled by Survivors within 20/28/36 meters alert you with a Loud Noise Notification.
Spies from the Shadows has a cool-down of 5 seconds between alerts.

While carrying a survivor the Auras of all other Survivors are revealed to you when they are within 16/18/20 meters of your location.