My demonic system

Earth realm has been dealing with humanity enemy the termids. The 13 protectorates of earth has been trying to overcome the war but they are overwhelmed by the Termids strength. Louis the last descendant of the glue family whom their body cell don't allow them to learn an ability came across a mystery knife which turned him to a demon and granted him a system. The system gave him power and also missions that put his life at risk. Many disadvantages come the system such as lust to kill a living thing and lust desires over woman. Some of the humans were taken as hostages by the Termids and demons Louis created his own army naming them 'The anti-demon army". Louis is the last hope humanity possess