I would LOVE a mirror boss, basically the room we fight the boss in is a giant mirror from different angles etc and it's very hard to know which one is the boss. There should be some relic where only one person gets to see which is the real boss, so communication is key.
It should also be hard to run around as you may end up banging the wall.
Made this up in two minutes, imagine it comes true :D
English
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Reminds me of the Bruce Lee flick, "Enter the Dragon"
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