レッドアイ

RedEye is a parasitic Dark Lord affiliated with the Kayblis Faction. Prior to becoming a Dark Lord, RedEye was an Enchanted gemstone created at an unknown point in the NC Era by a talented enchanter named Gaugau Kestina. Desiring to find a power great enough to defeat the Demon King, Gaugau gave RedEye the ability to attach itself to other creatures and objects and seize total control over them, amplifying their strength with its own incredible Magic. To assist with accomplishing this task, Gaugau bestowed the gem with a will of its own and programmed into it a basic directive to seek out whatever means it could to increase its magical power. There was no limit to the variety of things RedEye could place under its control: from Humans, to Monsters, to weapons, and even Dragons. [From AliceSoft Wiki]