After breaking 4/3/2 Pallets, Spirit Fury activates:

The next time you are stunned by a Pallet, The Entity instantly breaks it.
The normal Stun penalty still applies.
Spirit Fury deactivates after applying its effect.

You become obsessed with one Survivor.  When the Obsession loses a health state, your Terror Radius transfers to the Obsession for 30 seconds, and its radius is set to 32 meters.

You are granted the Undetectable status effect for the duration.

The Survivor with the transferred Terror Radius is also considered to be "inside the Terror Radius" for other purposes.

The Killer can only be obsessed with one Survivor at a time.  Undetectable hides the Killers aura, Terror Radius, and Red Stain.

You become obsessed with one Survivor.
Each time a Generator is completed, the following effects apply:

Reveals your Aura to the Obsession for 5/4/3 seconds.
All Survivors locations are revealed to you for 3 seconds.
Once the Exit Gates are powered, the following effects apply:

You are granted the ability to kill the Obsession by your own hand.
The Obsession suffers from a permanent Exposed Status Effect.
You can only be obsessed with one Survivor at a time.

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.