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After two hours of arduous and never-ending grinding, Frank managed to defeat two more Boss-type monsters, managing to get more dropped items of high quality, although he didn't manage to get something like the boots, or helmet of the set of armor, and got repeated items of the set he already got.
Alongside this, he got a few Runes, potions, and a ton of Magic Crystals, deciding to save them for later.
There were also around ten Skill Books he grinded from the Bosses and also from the normal monsters, although he did not get a new Evil Eye Skill Book, he had several repeated ones for the Blazing Claw, Shadow Bullet, and Fire Breath Skills, deciding to learn the ones he did not had and saving all the repeated ones to either gift them or sell them for App Points whenever he had the shop opened.
Check "The Protagnist's Sister Is Actually the Strongest"!