There exist a lot of swords made during the war-torn period that are engraved with names of Shinto and Buddhist deities the owners believed in or with mantra, which interestingly reflects warriors' naked feelings.
戦乱の時代に作られた刀に所有者が信じる神仏の名や真言が彫り付けてある遺例が数多く存在する事も当時の武士達の赤裸々な心情を窺わせて興味深い。