You become obsessed with one Survivor.
Each time you hit a Survivor other than your Obsession with a Basic Attack, Save the Best for Last gains 1 Token, up to a maximum of 8 Tokens:

Gain a stack-able 5 percent Cool-down reduction on successful attacks per Token, up to a maximum of 40 percent.
Each time you hit your Obsession with a Basic Attack, Save the Best for Last loses 4/3/2 Tokens.

When the Obsession is sacrificed or killed, you can neither gain nor lose any more Tokens.
You can only be obsessed with one Survivor at a time.

Whenever a Survivor is put into the Dying State by any means, all other Survivors within your Terror Radius will scream and reveal their current location to you for 4/5/6 seconds.

While carrying a Survivor you benefit from the following effects:

Decreases Wiggle effects, which cause you to strafe sideways, by 75 percent.
Increases Wiggle duration by 4/8/12 percent.

At the start of the Trial, the Auras of all Survivors are revealed to you for 7/8/9 seconds.
Extends the duration of a Survivors Aura being revealed to you by +2 seconds.
Lethal Pursuer benefits from its own effect.

Performing the Damage Generator Action on a Generator activates Trail of Torment:

Grants the Undetectable Status Effect until the Generator stops regressing or a Survivor is damaged by any means.
The Aura of the damaged Generator is revealed to all Survivors in yellow.
Trail of Torment has a cool-down of 80/70/60

When a Survivor is rescued from a hook at least 24 meters away, Devour Hope receives a token.

2 Tokens: Gain a 5percent Haste status effect, 10 seconds after hooking a Survivor, for a duration of 10 seconds.

3 Tokens: Survivors suffer from the Exposed status effect.

5 Tokens; Grants the ability to kill Survivors by your own hand.

The Hex effects persists as long as the related Hex Totem is standing.