by Kale » Mon Sep 20, 2010 2:40 am
Pato on the other forum recently mentioned that Moon Dew is one of the random items you can get for using Sarah's 'Spriggan Calling' spell in battle. Apparently it's one of the rarer ones, but at least it’s not the rarest. No idea if you’re looking at 10 or 10,000 casts of that spell before it coughs up a moon dew though.
Apart from that, I don't know any other way to get a moon dew in chapter 4. If you had a save file in chapter 3, you could potentially go back and make a moon dew at the witch's place, if you had the ingredients. I'd give Spriggan Calling a chance though, you might just get lucky.