AU! Ever since the announcement of the first born son of the King of Aincrad, no one has ever seen him. Fourteen years later, a mysterious boy appeared with extraordinary skills with two blades. But as two years passed, a danger approaches. The mystery boy disappears and the prince finally reveals himself. *Tied to The Two Swordmasters, recommended to read to understand it*

AU-ish. After a fateful encounter by the river with his sister, everything changes rather drastically for Robin. Losing the only people closest to him in a second, Robin ends up in the care of the Exalt, Emmeryn. From there, he grew up with Chrom and taught himself to be a tactician that Chrom could count on. With his frail body, that's all he could do.