Pyra

Pyra is Rex' Blade in Xenoblade Chronicles 2.

Story arc
Pyra is discovered sealed within the Ancient Ship by a crew of elite salvagers. The young Rex was first to find her, and touched the core crystal on the sword in front of her, prompting Jin to kill him. Rex then woke in a grassy field with Pyra, who explained this was a memory of Elysium, and she wishes to go back there. But because Rex is dead, she chooses to spend half her life force to revive him, thus becoming his Blade. The two escape and must fight Malos, who muses about five hundred years ago. With the help of Nia, Dromarch, and Azurda, Pyra and Rex escape, but crash on Gormott.