It would be awesome to see an extreme hardcore mod for players versus players or even bosses in the game, which would work by speeding up the drop rate for exotic weapons and higher rarity items where players only have one life. With that said, if a player and their character died they could destroy others for a period of time just like some monsters do with their ghosts. No restrictions. The friendly fire just wouldn't work in that case / of course it wouldn't necessarily be absolutely everywhere. After the ghost was destroyed the player would be returned to the menu with the option to start over with the same character. He would lose all the items that were dropped for the player who captured the ghost. Not only would such a mod help balance certain stats, but it would also allow players to jump back into the game and return to progress very quickly, but still at some risk of losing items and progress.