Backstabbed in a Backwater Dungeon Vol. 5 (manga)

Chaos grips the Elven Queendom as a massive, mysterious tower suddenly appears on the horizon. With Light's former ally Sasha as their guide, the White Knights—the queendom's strongest knightly order—march off to quell the threat. Little do they know that within, Light awaits with a fighting force of his own--and he's added the powerful gacha Iceheat, Mera, Jack, and Suzu to his ranks! The battle between sheer numbers and Level 9999 power begins!