There are 5 "story" Mandragoras in a dungeon near the tchia(never can spell it right) uplands on the way to the empire's capital.

A king, a queen, a prince, and two others... they are very powerful in that they all use every status effect in the book, there are five of them, and they run faster than... well something fast.

As far as I know, unless there are some rare game similar to them, they aren't in the feywood.

It is a story battle as part of the story progression.