Inside the Tentacle Cave Manga Vol 8

SEEKING LIGHT IN DARKNESS!Fornelis, the strongest Beastfolk knight in the kingdom, and Meltia, the daughter of the Elven queen, have entered the forest shrine in search of the holy blade of the Hero...but become ensnared in the Black Ooze's demonic grasp. Helpless to aid her former friend's daughter, Fornelis can only watch in horror and frustration as she herself suffers horrendous torment. Meanwhile, Mariabel finally finds the holy sword, the only thing that can defeat the Black Ooze...but will the fiend lurking in the shadows allow her to seize the sacred treasure?