In the world of Destiny, a world far into the future, the earth is in almost total ruin. The rest of humanity lives in the Last City. A life force called the Traveler gifts humanity it's light to resurrect previously deceased humans and these revived humans, called Guardians, are tasked with protecting Humanity from monsters. A very experienced Guardian is now entrusted with teaching a newly revived Guardian the basics of fighting with both weapons and the light. A rather easy task. Right?