I feel like you should be able to go back to any boss when you feel like it but to it's optional and in order to help other players because I feel like it's really unfair for other players who wants to help their friends but can't because 1. Their up to a point where they are a high level and don't want to reset just to help out and start over everything 2. The person already finished the quest and can't go back and help the other person who really needs help and can't do it alone and their gear might be broken or they don't have enough spells in that certain spell trees, and maybe isn't strong enough or don't know how to fight back really well their should at least a piece or button saying "Would you like to fight this boss again? And don't worry it won't restart your quest" The button or something should be available when you beat the boss and completed the quest. to at least help someone in need incase their not having a good time or having a pretty hard time taking the boss down and as I said optional you don't have to do it by force it's "When" you want to do the boss again incase a player needs help in a certain quest and needs to defeat the boss enemy's to do it or when your bored.
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