Adrian could more or less confirm that there was someone that awakened the Hell Beast. The fortifications on that monster are so deliberate that one would see if they can distinguish magic circles. Adrian also thought that the devils attacking the Hell Beast or at least some of them were also in on the attack.
The Devil Dark Stone might be very enticing, but one would definitely lose interest if they cannot deal substantial damage. Adrian wanted to find the culprit with Ark, Pana and Basil but he is tied with the Hell Beast as of now. If such a monster would be unleashed, then the main world would become incredibly difficult to live in.
[You have dealt 100 damage to the Hell Beast.]
"The damage is still incredibly negated to the point that I rarely get anything." Adrian stated as he fired arrows numerous times, but each arrow only dealt a hundred damage.