I ran across these on the way to kill a few swoops earlier this week. I did a quick check on Stratics and didn't find any mention of them. Are these event items? There were two black L-Ag gates, a black earth-ele type L-Ag monster and a chest. Double click on the chest and you get the Solid L-Ag Substance with about a 250 hour timer deposited into your backpack. Oh, and there was a L-Ag Farmer in a giant spider's cocoon too. Now it's all gone or moved, except the Solid L-Ag Substance in my backpack.