which mobs drop em?
Uhm... you don't really need to farm millet. It's absolutely everywhere. I can't walk 20 feet in any of the areas without tripping over a bag of it. Makes me wonder what's so enticing about millet in the first place.
Check, like, any building, delve, dungeon, pile of sacks, ship, warehouse, camp or just about any sack laying about. You're bound to find it.
There are like 4 of them in the tutorial area of Coldharbor alone.
Millets are important crops in the semi-arid tropics.................The crop is favored due to its productivity and short growing season under dry, high-temperature conditions.
So, if it were possible to grow your own crops, Reaper's March might fit the climate for Millet. Of course, you can't.