Saying that, the white-haired, white-eyebrowed old man―― Olbart, carried the collapsed enemy with his lone left arm, using the tips of his toes to give a light strike to the defensive wall beside. As he did so, the surface of the wall rippled as if it were water, and stuffing the enemy’s body inside, it was swallowed, after which the wall’s surface filled back in.
Fortunately, it seemed like the undead were able to go without breathing, so he could bury them in the walls to settle things without having to kill. –Arc 8, Chapter 58