The Slaying Edge (キルソード鍛) is a sword and a weapon skill that appears exclusively in Fire Emblem Heroes.
Overview
The Slaying Edge serves as a more powerful counterpart to the Killing Edge primarily accessible through the Weapon Refinery. While it shares the special trigger acceleration effect with the Killing Edge, it offers greater Might and further refine options.
At the time of writing; Rutger and Saber come with this weapon as part of their default kit.