Twilight (Buffy the Vampire Slayer)
WordNet
noun
(1) The diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth
(2) A condition of decline following successes
"In the twilight of the empire"
(3) The time of day immediately following sunset
"He loved the twilight"
"They finished before the fall of night"