The Price of Power...?

Spoilers for Fire Emblem Echoes: Shadows of Valentia.

Distraught by news that Alm is the late-emperor's son and true heir to the Rigelian throne, Berkut takes drastic measures to gain the power to defeat him once and for all. It doesn't quite go as he intended.

This can also be called "The Fanfic Where Bolt Abuses Italics."