Hinokagutsuchi

Kagu-tsuchi or Kagutsuchi (カグツチ), also called Kagutsuchi no kami (迦具土の神), Hinokagutsuchi (火之迦具土), or Ho musuhi (火産霊), is the kami (神 "god; deity") of fire in Japanese mythology.

Possible Meanings
The Hinokagutsuchi (ヒノカグツチ, Hinokagutsuchi) concept has persisted as a common thread throughout the evolution of Megami Tensei, originating as the demonic sword wielded by Nakajima Akemi in the original novels, and most recently appearing as a final boss in a groundbreaking Megaten title. Though more often introduced as a key character or plot device, Hinokagutsuchi has occasionally appeared in devil form as well.

Shin Megami Tensei III: Nocturne
The most recent appearance has been the endgame boss of Shin Megami Tensei III: Nocturne as Kagutsuchi.

Digital Devil Story Megami Tensei novels and anime
Demonic sword Hinokagutsuchi

Digital Devil Story Megami Tensei series and Kyuuyaku Megami Tensei
Sword Hinokagutsuchi no tsurugi (ヒノカグツチの剣)

Shin Megami Tensei series
Amatsukami Hinokagutsuchi (ヒノカグツチ)

Fusion sword Hinokagutsuchi (ひのかぐつち)