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Nice ideas with good scope for redherrings, but only two groups worked, while the others were inconsistent and had entries that didn't belong. Darken doesn't mean gloom or low levels light - those are both nouns; darken is a verb. Nirvana isn't a location in Indian religions, it's just the idea of the soul's release from the cycle of reincarnation. You could change the link to 'afterlife' so Nirvana fitted,but then Arcadia wouldn't fit, as it's a mythical or idealised poetic location, with no connection to the afterlife.