|Art Nouveau Absinthe Poster by MyBeautifulMonsters|
The recipe for elven abinthe is a closely guarded wood elf secret. While other absinthes are said to cause hallucinations of the green fairy, the sights created from drinking elven absinthe are not hallucinations but actual visions in the Feywild.
Being an extremely strong spirit, the constitution DC saving throw to avoid intoxication after drinking a glass is 20. In addition, on the third failed Constitution saving throw, the character (and his gear) are transported to the Feywild.* Bottles of elven absinthe can't be purchased, though wood elves are known to bring them out for celebrations and gift them to those that have done a great service to their people.
*I've revised my alcohol house rules. Also I realize that real absinthe is nothing like the legends of absinthe, but this is a fantasy game and I wanted to have some fun.