Whenever the Killer is within 36 metres of your location, Spine Chill activates, lighting up its icon.
If there is a Terror Radius present, Spine Chill will reveal its intensity using its icon.
If the Killer is within range and looking at you with a clear line of sight, you benefit from the following effect:

Increases your Action speeds in Repairing, Healing, Sabotaging, Unhooking, Cleansing, Blessing, Opening, and Unlocking by 2/4/6 percent.
This effect lingers for 0.5 seconds.

Your ferocious tenacity in dire situations allow you to benefit from the following effects:

Increases your Crawling speed by 30/40/50 percent.
Grants the ability to crawl and recover at the same time.
Reduces the volume of Grunts of Pain while in the Dying State by -75 percent.

Reduces the volume of Grunts of Pain while in the Injured State by 25/50/75 percent.
Iron Will cannot be used when suffering from Exhaustion, but does not cause the Exhausted Status Effect.

After performing a Safe Hook Rescue on another Survivor, Deliverance activates:
Causes your next Self-Unhook attempt to always succeed.
Causes the Broken Status Effect for 100/80/60 seconds after unhooking yourself.
Deliverance is not available during the second Hook Stage or if you are hooked as the last living Survivor in the Trial, regardless of your Hook Stage then.