Item World
Item World is one of the battle modes in the HentaiVerse mini-game.
Item World allows you to do battle inside any piece of unequipped gear in your inventory. An Item World has as many rounds as the equipment you enter has levels. Clearing an Item World may increase the level of the item depending on your difficulty setting. If you play on Hard or higher, the item can gain several levels in one go. If you play below Normal, the item may not gain any levels at all. When an item levels up, its stats will increase in accordance with level scaling (though this may not be immediately visible, due to rounding).
The difficulty and experience gained depends on the quality rating of the item -- a Magnificent item will have significantly harder mobs than a Crude one. Like in the Grindfest, monster damage starts at 50% base and increases by 1% per round. Experience gain is significantly higher than the equivalent difficulty Grindfest, however you do not gain any credits inside the Item World. Item world does, however, have the same drop quality bonuses as Grindfest.
After clearing an item, you cannot re-enter it for 20 hours, but you can immediately try again if you're defeated or escape. Additionally, an Item World's cooldown time persists between players -- if a player buys a piece of equipment that was recently cleared by the previous owner, they will not be able to enter it until the 20 hours have lapsed. You can only enter the Item World 10 times per day (dawn to dawn).