The Auras of Survivors, who are healing or being healed, are revealed to you when they are within a range of 20/24/28 meters.

Fresh blood marks are considerably more discernible than normal and can be tracked for 4 seconds longer than normal.

Instead of snuffing Boon Totems you destroy them.
Destroying a Boon Totem this way reveals the Auras of all Survivors that were within its range at that moment for 6/7/8 seconds.

The Scratch Marks left by Survivors spawn slightly/moderately/considerably closer together.

When hooking a Survivor, all other injured Survivors suffer from the Hemorrhage and Exhaustion status effect for 45 seconds.

Blood Echo has a cooldown of 60 seconds.

Exhausted prevents survivors from activating exhausting perks.
Hemorrhage regressing healing progress when not healing, and increases blood trails left by injured survivors.

"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."