Doom Sword appears on Paths 4 and 5 of Yomotsu Hirasaka within the Midnight Channel. It is solely a physical attacker and has the ability to counter physical attacks from the party. After being defeated, it may drop a Holy Gold Lump. Selling 10 Holy Gold Lumps at the TV extension of Daidara will unlock the Dullahan weapon for Kanji Tatsumi.
Doom Sword appears on Blocks 4 and 5 of the Theater District. It is solely a physical attacker. When defeated, it may drop Sword Cache and Sword Rune. Sword Cache is used to create the Amazon Axe for Haru, the Omega Saber for Akechi, the Antimatter Gun for Aigis, the Kashin Koji for Yosuke and Koromaru, the Yume-no-Hashi for Yukiko, the Red Demon Blade for Yusuke, and the Eternity Dress armor for females. Sword Rune is used to create the Damascus Rapier for Mitsuru, the Chromatic Orb for Morgana, and the Excalibur for the P3 hero.