The Cursed Sword Alhazard is an ancient relic forged by the God Chaos. It is a powerful blade that can channel mana--a potent substance that can harm even the Gods. Alhazard is able to be wielded by half-demons as well as humans imbued with the power of darkness. It greatly increases the strength of those aligned with the darkness, including members of demonkind. Should a normal human attempt to use the blade, it is possible that its power could corrupt them, transforming them into a mere vessel for Chaos.
In response to the Cursed Sword, the Goddess of Light forged a blade of her own: the Sacred Sword Langrisser. Though its immense power rivals that of Alhazard, it does not have the ability to channel mana.