When you or the Obsession are injured, you both see each other's Auras.

After healing the Obsession or being healed by the Obsession, you both gain the Haste Status Effect, moving at an increased speed of 5/6/7 percent until you are no longer within 16 metres of each other.
If you are the Obsession, Blood Pact deactivates.
Lowers the odds of becoming the Killer's initial Obsession by -100 percent.

The Killer can only be obsessed with Survivor at a time.

Unlocks the Self-Care ability, allowing you to self-heal without needing a Med-Kit at 25/30/35 percent of the normal Healing speed.

After triggering your third Protection Hit, Mettle of Man activates:

While injured, Mettle of Man shields you from going down the next time you take damage.
Healing back to full health will reveal your Aura to the Killer whenever you are farther than 12/14/16 metres from them.
Mettle of Man deactivates the next time you are put into the Dying State.

Increases the odds of becoming the Killers initial Obsession by +100 percent.

The Killer can only be obsessed with Survivor at a time.

Increases your Healing speed by 100 percent when healing a dying Survivor.
When performing any of the following actions, Were Gonna Live Forever gains 1 Token:

Performing a Safe Hook Rescue
Taking a Protection Hit for an injured Survivor.
Stunning or Blinding the Killer to rescue a carried Survivor
Consume 1 Token to grant the Endurance Status Effect for 6/8/10 seconds to any Survivor healed from the Dying State