Nakama ni Uragirare Shokei Sareta Shireijutsushi, Undead-ka Shiteita Eiyuu 10000-nin wo Sosei Shi Saikyou no Oukoku wo Tsukuri Fukushuu wo Kaishi Suru: Anei no Gyokuza ni Eirei wa Tsudou

After defeating the Demon King, the necromancer Crow was betrayed by his comrades and buried in the "Abyss." However, he resurrected himself by transforming the miasma into his own power, and completely revived 10,000 heroic spirits in a city that had once been destroyed by a god. Then, he gathered the strongest army, who swore absolute loyalty to him, and built his own kingdom. Crow begins his merciless revenge against his traitors and the god who was behind it all. An overwhelming dark fantasy begins...! (Source: Kodansha, translated)