The Forbidden Beasts were designed by the Post-War Administration Bureau “Shuusen Kanrikyoku” (終戦管理局) as an Anti-Gear Weapon (similar to OutRage, but much riskier). This was their alternative to complete Gear conversion (turning humans in to Gears), since Command Gears could control any Gear they created easily. Through this means they hoped to capture the Gears and dominate them. On an instinctive level, Gears and Kinjuu determine themselves to be natural enemies, like prey and predator respectively. 卑・泥獄堕法第五法｢触精影陣｣ 『エディ』 Hi-Deigokudahou: Dai(go)hou [Shokusei Kagejin]: “Eddie”