"Your will and mine be now as one!" - Sothis when Byleth uses his/her Final Smash.
Byleth swipes the Sword of the Creator forward, turning it into a whip. Any opponent caught by his/her whip will be transferred to a cutscene. In the cutscene, Byleth's hair will turn pale green and Sothis will appear behind him/her. Byleth then unleashes one huge, powerful swing the Sword of the Creator, causing debris to be launched to any opponent(s) caught in his Final Smash, launching them away.
In Fire Emblem: Three Houses, characters have powerful skills they can use called Combat Arts. Each weapon has a unique Combat Art depending on various circumstances, such as weapon class for example. The Sword of the Creator's signature Combat Art is called Ruptured Heaven. Where when used, Byleth will swing around the Sword of the Creator around multiple times, causing anyone to get hit by the sword slashes, being able to kill almost every common enemy even as soon as Byleth is able to use the Sword of the Creator in-game.
- Like with Incineroar's Final Smash, Byleth's Final Smash is a more powered-up version of an attack that they can use in their home game.
|Byleth's Special Moves|
|Up Special||Sword of the Creator|
|Final Smash||Progenitor God Ruptured Heaven|