The Hand of Merlin

After some encounters you will hear a chime or a bell, this indicates you have increased 1 reputation in fey.  This is a little bit luck based on getting enough of these encounters but isn't too hard if you take the longest routes through each level.
 
You will increase your reputation by choosing the good outcomes, like helping people, or helping animals or just being generally good.  Do this 7 times and the trophy is yours!