The life of a simple adventurer

As a powerful adventurer (Mazak) was sent on a quest to slay a demonic horde conducting experiments, he noticed an illusion wall in the cave he was fighting in. Just as he was about to inspect the anomaly, the surviving demons led Mazak into a room of dead bodies and young children from human to beast-men. it did not take Mazak long to kill the demons in the room. After the children calmed down Mazak showed them how to escape the cave, before they escaped Mazak looked through the illusion wall.