It is also an interesting study in sociology, as social groups organize to adventure together, and defend themselves from [Player Killers]?. There is also a significant economy associated with Diablo II, because the most powerful magic items are rare, and are often traded. Interestingly, this trading occurs in-game, and in the real world. Certain "unique" items can sell on Ebay for upwards of $500USD.
One interesting component of this game is the existence of the Horardric Cube. This is a game article that can change certain treasures into other treasures. For example, 3 partial rejuvenation potions may be combined to produce a full rejuvenation potion.