How NOT to Summon a Demon Lord (Manga) Vol. 11

In Zircon Tower, Diablo and his companions have hit rock bottom. Batutta--the Paladin captain behind the frontier city's deadly outbreak of  Marked Death Disease--has captured Rem and Lumachina, and plans to use them for his nefarious scheme. But when Diablo ventures underground to save them, Batutta deals a debilitating blow to his left arm.  Severely wounded, and unable to use his most powerful magic, has Diablo finally met his match?