Second Chance Marauding

When Moony, Wormtail, Padfoot, and Prongs created the Maruader's Map, their only thoughts were to create a map to aid in mischief. What they created would reverberate through time and not only affect their world but the future as well. What have the Marauders done, and how will this effect the future? Marauders, Golden Trio, Battle of Hogwarts later.