How to Build a Dungeon: Book of the Demon King Vol. 9 (manga)

THE DARK NIGHT OF THE DEMON KING!

Aur sacrifices his body in an attack against Saint Melissand! A brace of Heroic Souls swarm the Dungeon Heart but are sent scattering by an explosion. The undead body of Melissand rises again. Having lost their master, Lilu, Yunis, and Spina plan their counterattack...

The final showdown between the Demon Lord and the cursed Saint is here! What secret drove a man to curse his own daughter? And, finally, the wives and the Demon King are mystically bound and spend their first night together!