Last Rebellion

In the world of Junovald death is not a natural process. After dying all living things come back as monsters, and the monsters will revive eternally. Only the power of a Sealer can put a soul to rest. After a new weapon is delivered to a remote kingdom to deal with their monster problem the king and his eldest son are slain, and the weapon stolen. A Sealer, Aisha, takes the soul of the dying Blade, Nine, into her body, allowing him a second chance for vengeance. (Mobygames)