Read Fukushuu wo Koinegau Saikyou Yuusha wa, Yami no Chikara de Senmetsu Musou suru Manga - ManhwaHen (復讐を希う最強勇者は、闇の力で殲滅無双する, The strongest brave who craves revenge, extinguish with the power of darkness, The Hero Who Seeks Revenge Shall Exterminate with Darkness)