Wiktionary
n. The point at which night begins.
Usage examples of "nightbreak".
It hinted at two wars between the demons' empire and the Watchlands, and because records of the first war -- the Nightbreak War -- were scant, Biantha had yet to understand certain cantos, certain equations, that dealt with it.
Neither have they forgiven Evergard their defeat in the Nightbreak War.
How had Paienne felt, she wondered suddenly, when her father's treachery became part of the Nightbreak War's history?
Late at night, when she walked the battlements listening vainly for the footfalls of marching soldiers, feeling betrayal's cold hand in every tremor of the wind, she remembered tales of the Nightbreak War.
She had thought about the strange symmetry, the Nightbreak War's traitor -- but failed to consider that, in the Prophecy's second war, the corresponding traitor might betray the demons.