The Dweller on the Threshold

Cooper, you may be fearless in this world. But there are other worlds. Worlds beyond life and death. Worlds beyond scientific reality.

Cooper: 

Tell me more.

Hawk: 

My people believe that the White Lodge is a place where the spirits that rule man and nature reside. There is also a legend of a place called the Black Lodge. The shadow self of the White Lodge. Legend says that every spirit must pass through there on the way to perfection. 

There, you will meet your own shadow self. 

My people call it The Dweller on the Threshold.

Cooper: 

Dweller on the Threshold.

Hawk: 

But it is said that if you confront the Black Lodge with imperfect courage, it will utterly annihilate your soul.