The Great Cleric 11

With the help of the Adventurers' Guild, Luciel uncovers the mastermind behind the attack on the healers. And, once again, it seems as though fate is pushing him towards the newly-awakened Labyrinth—the source of all Yenice's recent troubles. Luciel and his allies venture into the Labyrinth, but strength alone won't be enough to make it through this time. If they want to leave the Labyrinth alive, they'll need to work together, get creative, and fight with some "substantial eXperimentation."

Volume 11 of The Great Cleric manga series by Hiiro Akikaze.