Early Sunsets

Does this sound like a somewhat okay plot line, or is it too far out there? I'm at the point in a fanfic where the story is getting deep, but I don't want it to sound too crazy or conspiracy-like or anything. I'll try to explain it as quickly and simply as I can.

There are two groups of ponies who have been rivals for nearly a thousand years. One pony, a gifted enchanter and one of six remaining leaders of group A, corrupts the opposing group B by sending them a pair of ponies, who use magicked items from the enchanter to take leadership of a part of group B. As leaders they cause infighting in that group, weakening them militarily. The enchanter in group A convinces the other leaders to attack group B unprovoked, with the ultimate goal of killing the other five leaders of group A during the hectic battles so he can take control as the sole leader of group A while wiping out the rival group in the process.

Hm. I just realized that what I made vaguely sounds like the plot for Attack on Titan. That was unintentional.