Cultural Questions: Essence of Moonlight and Morning Dew

[Brogean]

Greetings!

I have a question for you all about the Essence of Moonlights that drop in Mistmoore.
First off,

1.) does the Essence of Moonlight have a chance to drop off every mob in Mistmoore? someone said they drop on the Undead mobs (Example: Will Sapper) but are alot more rare on regular non-undead mobs such as A Deathly Usher. do they even drop on non-undead mobs?

2.) Morning Dew... i could be confused, someone said you have to forage these?
the Wiki says they drop off the Fairies and Brownies in Faydark area. Should i start killing these guys for them? Also, are there any faction hits for killing fairies?