Daguva

Daguva (ダグバ, Daguba) is an ancient and powerful magical spear, crafted centuries ago by an unknown blacksmith. It gained an infamy as the Legendary Spear of Kings (王の伝槍, Ō no Tenshō), since anyone who ever wielded the spear were known to become powerful monarchs at some point in their lifespan, thanks to its immense power, but also due to possessing a form of sentience to guide its wielder to achieve greatness.