During the game, we find many oddities.
My guess is that some might be quest items or others are probably just junk to be sold.
What oddities are quest items?
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Oddities are indeed vendor trash, however, some of them might be marginally useful in some situations: For example, Chromavulum can be used to help you solve the colour puzzle in the Order of Truth. This doesn't mean you won't be able to solve this puzzle without it.