well Well first of all need to kill dryads during month of june, artic June, arctic faun need to be lucky to land in that island by asking for shortcut in porthope ( i recomend Port Hope (I recommend to try during 10x all the 3 days), about other fey monsters, the night monsters can also be found in a hole near of the green shrine , shrine, the other ones can be found during day in the surface, i I would focus on swan maiden and boggys since are the ones with less amount, the others you probabily probably end when done with those.