Swordstones - For being a two-star item, these seem crazy rare. I've only ever seen one drop from a treasure chest.
Force Dynamos - Need this one for a plate shield and some other things. Never seen one yet.
Redwood - Pretty obvious which enemy this will drop from, but no luck so far.
The Antigua and Sealed Sword. - Anyone ever seen these or the recipies for sale? They're a pre-req for some four-star weapons, some of which I already have the rest of the mats for.
Rock Core - This one I have seen, but haven't gotten yet. Hoping to upgrade my jelly armor with it soon.
And then the opposite of that, items you have that you don't know what to do with yet.
Blaze Pepper and Bushy Tail - The path to the core this week was through a lot of wolvars, so these dropped. Haven't seen them be used in a recipe yet, though.
I've been looking for Redwood for some time too. However I'm not aware of which enemy it comes from. Care to enlighten me? :D
I'm the same with, Swordstone. I've only got one Swordstone, and I think it was a treasure box too.
Also looking for things I've never seen before such as Fuel Canisters, a Trojan Horseshoe, Force Dynamos, a Sealed Sword and Miracloth. I'm finding Fine Fabric hard to find too. This might take awhile!