A long time ago, no perhaps in the future? No, that isn't right either. Well it isn't happening now. Bah, well at some point there was a war. Well yeah obviously wars are pretty common I guess. This was no ordinary war though. Oh, no no no. This war was extraordinary, spectacular, intense. Every country in the world was involved. All the little tribes too. Oh but it was something awful. Fighting lasted at least a decade and by that point, oh the catastrophe that ensued. The land was barren and beat. Cities lay in ruin and it seemed impossible to rebuild. But they tried anyway. Oh yes they tried. Mages that before used their magics to destroy used them to build. Soldiers dropped their swords and picked up hammers. But alas it was all for not. The land was too destroyed. Country and faction relations were all but upon war again. So the mage council tried something. Ooh hoo hoo hoo. Something big! Something never before thought possible. Well actually they tried two things. The first was that whilst rebuilding they tried to mind wipe the war out of everyone. Could you imagine? Charming the entirety of the globe's population. Insane! So of course that didn't work. Most of the regular were indeed subject to it, but a vast majority of soldiers and other such combatants would never forget the troubles they had seen. So the council had a different idea. This was the crazy one! They would turn back time! For the entire decade, and a bit before to prevent the outbreak of war. Fifteen years they said. They would turn back fifteen years! Now mages were said to sometimes get strong enough to bend time. But that would only be a few minutes at best! So you see, they were crazy. But somehow, it worked....
Ravings of old man Averbeern, once great mage.
-------------------------------------- The pcs can discover that such an event as this happened. I was thinking something along the lines of certain zones in the world didn't reset quite right. Such as an ancient, very magical temple or something like that which would be unaffected by the time warp. Finding things like this would really be quite intriguing.
I was also thinking that a select, very few npcs kept their memories. These would be very exceptional people(prolly about level cap for whatever system is being used). And some of them I working hard to stop what caused the war in the first place, while others want war because they gained great glory during it and are now all but forgotten.