I left the "Arcanum-Kingdom," once again to go to a "Library-Dungeon," within the -
"Monster-Forest," at my -
"True-Power-Level," and I killed everything Despite the odds not being in my favor because my "Spell-Formulas," And my Magic-Skill were Superior.
I left with the Treasure and went directly back to my Kingdom.
I had 13 Sets Of 888 Trillion Magic Books after the Dungeon so I stored them in my -
"Arcanum-Kingdom," Royal-Library