The "Flos tentaculata paludis" grows in swamps and blooms once every three years

Pretty but dangerous:

When in bloom, white fungi will appear on the tentacles. These are the result of the sad tears of love-sick swamp fairies over the past three years. When feeling threathened, the fungi start spewing out dirty black clouds of vaporous dust. When breathed in, you have 14 hours to get the antidode or you will spend the rest of your life crying your heart out.

For the antidode you need: 50 mosquito legs, 80 grams crushed root of the purple swamp lily, 10 drops of blood from the heart of a living virgin toad, and 20 wings of happy fairies. It is very important the fairy is happy at the exact moment you remove her wings. Crush and mix it all up with half a liter of tree sap, and drink it in one go. You will get horrible spasms and cry for about an hour.

If you are strong enough to survive this, you should then be perfectly fine again to lead a happy fulfilling life. (That is, if you can forgive yourself for the horrific fate you brought upon those 10 fairies!)