Ice of death and vampires

The world is desolate by eternal cold after an event that occurred eight centuries ago that became known as: "The long night" where magic came into the world that only vampires also came and the earth was in an eternal winter where humanity is Forced to live in cities with huge heat and energy generators how it is also forced to fight for survival in the war that already lasts 8 centuries against vampires and their almost immortal forces _________________________________________ Reference to multiple works such as: Code Geass, Castlevania, Game o Thrones, Your Throne and many others.