Equestria worst wars was before the princesses and Discord`s rule over the country. A time of pain and suffering, an evil dictator makes a warrior, a super solider.
Twilight has heard this story many times before and through nothing of it, but when she has the change to examine the said dictator`s secret bunker, she finds more than files.
The scientist who created them.
His knowledge and memories stored in a magic orb. He has been hibernating in it, only will be awoken if somepony rubs the orb (like a genie lamp) He will also have the ablity to takeover a pony's mind and body (once and can chose who he takes over)
Geiger Anomaly
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5072937 thank you for your opinion. I really value it. (By the way I actually value your opinion I not being sarcastic)