The mid boss being bound became quite easy to defeat for Piggy Bank. It was easy in the sense that all he needed to do was fight it using numerous Money Punch skills. All he had to do is continuously punch at the Grand Storm Guard as it crumbled into dust.
[Your party member, Piggy Bank, has successfully defeated the Grand Storm Guard.]
[You did not get experience due to the fact that you are extremely high leveled compared to this dungeon.]
Adrian did not think too much about the experience as he has already gotten what he needed from Piggy Bank. He was more worried that he will not get the Spell Harmony Passive skill as it was very difficult for him to cast powerful magical energies at the same time. It might have been easy to get he passive skill if he can cast basic magic elements, but he cannot do so.
Edited guys! Apologies for the mixup of upload. Thank you for your patience.