 The likelihood of an item appearing is based on the number of players in group or whether any of them have a "lucky" item attached.The reward is obtained by whichever player first reaches it, meaning that players who contributed little to the fight are able to receive the item, while a player who dealt the most damage or final blow to the boss might receive nothing.The player who kills the most viruses is titled the "MVP" and receives a small experience bonus equal to the number of people in the group.