Purification.

Valerian sat inside the dark mist, surrounded by dead friends. A fiend looked like a skeleton made up of black bones. If someone was to look at this thing without the black mist blurring the scene, they might lose their minds. As for the faint-hearted, death was the only thing that awaited them. 

The young man had his eyes closed, but every time the death fiend neared him. It bit into his flesh. The impurities were sucked off from the depth of his body. The impurities had been living deep in his body for ages and were now a part of his body. When sucked out, it felt like someone was tearing him apart. 

However, despite the pain and trauma, he had to suffer and tolerate all this. The reason was to defeat the Tyrant and avenge his parents. His resolve was not weak, and he would not stop until his goal had been achieved. Either that or his death was the only thing that would stop him.