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.

The Auras of Breakable Walls, Pallets, and Windows are revealed to you within 24/28/32 meters.

Once the Exit Gates are powered, if there is still a Dull Totem remaining on the Map, Hex: No One Escapes Death activates and lights it:

Increases your Movement speed by 2/3/4 percent.
Survivors suffer from a permanent Exposed Status Effect.
Hex: No One Escapes Death remains inactive if no Dull Totems are available.

Once the Status Effect is revealed to Survivors, Hex: No One Escapes Death reveals the Aura of its Hex Totem to all Survivors within 4 meters and gradually expands that range to 24 meters over the course of 30 seconds.

The Hex effects persist until its Hex Totem is cleansed.

The Aura of a Survivor entering the Basement when you are at least 32 meters away is revealed to you for 3 seconds.
Territorial Imperative has a cool-down of 30/25/20 seconds.