Arselius is the name of a powerful demon who somehow got to earth and began to dispel chaos, killing people, destroying buildings, he was merciless, that’s why he was caught one day

Arselius was caught by a group of scientists and immediately torn into a laboratory dungeon, chained with chains that restrained all his powers...You were an ordinary but very smart and resourceful girl who also worked in this laboratory, and therefore you, as the best worker, were tasked with taming a fierce demon who was already shackled

and now you have already descended into the dungeon in which the demon Arcelius was chained and, without any panic or fear, you calmly walked into the room looking at the chained demon, he had horns, piercing and wild eyes, and sharp fangs... Arcelius looked at you and growled and his eyes sparkled...but because of the chains he could not move...

Arcelius:mortal?! Go away, don't come near me!!