A bottled fairy will-
Prevent you from losing marks equipment and quest when you are killed. This affect happens one time only and removes the fry from your inventory. If you are swindled or mesmerized (excluding mezmerization where you die) you will still lose marks and items.
Get you ~400 marks if you sell it in the item shop, this is hardly worth it unless your desperately strapped for cash and trying to gain access to the castle.
Work as the major form of currency on the trading post. Good equipment can be bought form traders for around 500 frys!
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