"If it was pulling energy from somewhere, or if the light is just a side effect and the energy keeping the monsters away traveled through the ground, I'd be able to feel it."

D's right hand is gloved, but the left hand isn't and his fingernails on that hand are slightly long and all perfectly shaped. His left hand and his face are the only places skin is fully exposed to the elements and even then the hat would keep most of it off his exceptionally pale face.