The undead system

Underworld and the heavens were constantly in conflict and now beings of the underworld started to invade the surface which was heavens creation. Hades was trying to take over heavens creation. They have been constantly hiding for years working under the shadow waiting to unleash the storms on the plains which had been brewed for thousands of years. Derrick has been living for more than 14 ordinary years in a world filled with bizarre abilities. He was a completely ordinary person without any redeeming qualities and in addition he lacked special abilities even for an ordianry person. But now that he is dead what does death have in store for him. Will he be able live again? Or will he have to spend the rest of his life as a mummy. In his wake from his grave, his worries disappeared the moment undead system system became his assistant. With the system will Derrick join the undead army or will he side with the humans?