While Cliff, a 27 year old young man, was visiting his grandparents, he was caught in what is called a "summoning" which took him to a forest infested with unknown creatures, he decided that in order to survive, he should be ready to brave all the dangers that would present to him, with his “drain” skill he would fight them to become stronger
Cliff was facing two variant demons. Yet, this didn't scare him as much as the thought of facing Kido in a duel.
His adversaries were likely creatures that had spent years in the forest, immersed in a perpetual struggle for survival. They possessed battle experience and instincts that he lacked.
So, what did Cliff have that they didn't? He wasn't arrogant enough to think himself smarter simply because of their wild, raw nature. He had been told, and had confirmed himself, that the intellect of demons often rivaled that of humans. And as they advanced in rank, some could even surpass human prodigies in thought.
Cliff took a moment to observe his opponents. The first was tall, towering over him with a massive body and a rhino-like head. It wielded a huge metal mace covered in spikes. Despite its muscular and imposing physique, Cliff knew this wouldn't be an easy opponent.