For each Survivor you hook for the first time, No Way Out gains 1 Token.
Once the Exit Gates have been powered, No Way Out activates:

When a Survivor interacts with an Exit Gate Switch, you receive a Loud Noise Notification and The Entity blocks both Exit Gate Switches for 12 seconds and an additional 6/9/12 seconds per Token in your possession, up to a combined maximum of 36/48/60 seconds.

The last 2/3/4 Survivors hit with either your Basic Attack or Special Attack suffer from the Blindness Status Effect.

The Hex effects persist until its Hex Totem is cleansed.

Iron Maiden increases your Locker Search speed by 30/40/50 percent.
Survivors who exit a Locker suffer from the following afflictions:

Scream and reveal their location to you for 4 second.
Suffer from the Exposed Status Effect for 30 seconds.

"Each time the Obsession loses a Health State, Remember Me gains 1 Token:

Increases the Opening time of both Exit Gates by 4 seconds per Token, up to a maximum of 8/12/16 additional seconds.
The Obsession remains unaffected by this penalty.
You can only be obsessed with one Survivor at a time."