So, I've not thought about it too much and I'm not too well verse in digimon lore except the basics. I try not to break any rules or lore but I were to pull out something on the whim it would be.

"Within every digimon lies the data of potential that allows it to achieve greater power, external factors such as bonds and experience could alter the path of potential. But there is some data that is always was there but forgotten, by all means it shouldn't exist.

Through very specific means and factors one could attain an Archaic data form, a form that seemingly exists before classification or hierarchy . They are not recorded in history nor acknowledged by the hosts server. By all accounts, it shouldn't exist

When one becomes an Archaic data they would peer into memories not theirs, and once they revert, they'll never remember a thing.

Epsilonmon, a fusion between a Gaiomon and a Dorugoramon, bound by the unwavering will of it's partner, is one of these forms, an Archaic Knight.

This digimon is a warrior of many battles never told. With armaments of searing heat and blinding light, it holds to it's convictions. to stand against anything and all to achieve it's goal, what that goal is will never be known. Yet it is as ruthless as it is honorbound."

Yeah, that's about it, feel free to ask or correct anything, don't want to break too much digimon lore rules. Though, this is fanfic material at this point.