Sword of the Creator

The Sword of the Creator (天帝の剣 Tentei no Ken, Sword of the Supreme Deity) is a sword that originated in Fire Emblem: Three Houses and is one of the Heroes' Relics. It requires someone with the Crest of Flames to wield.

Etymology
Tentei (天帝) originates from the Chinese word Shangdi, meaning supreme deity. It is commonly used as a title for creator gods or generally the highest deity in most religions/mythologies in ancient and modern Japanese.