Each time you hook a Survivor, Leverage activates and gains 1 Token, up to a maximum of 10 Tokens:

For each Token, the Altruistic and Personal Healing speeds of Survivors are reduced by a stack-able 3/4/5 percent for the next 30 seconds, up to a maximum of 30/40/50 percent.

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.

Two trapped Hex Totems will spawn in the Trial Grounds.
When either Hex Totem is cleansed or blessed, all Survivors suffer from the Exposed Status Effect for 40/50/60 seconds.
The second Hex Totem will immediately turn into a Dull Totem.

The Auras of Survivors within 2/3/4 meters of any Dull Totem are revealed to you.

When another Perks Hex Totem is cleansed or blessed, its Hex is transferred to the Hex: Undying Totem, including any accumulated Tokens, disabling Hex: Undying instead.
The Hex effects persist until its Hex Totem is cleansed.

Any Survivor performing a rushed action within 48 meters of your location has their Aura revealed to you for 6 seconds.
Im All Ears can only be triggered once every 60/50/40 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.