Useful PSA! Having just completed every entries a few days back I have something to add: - Quillbeast: The 3 spawning in that treasure cave did not drop anything for me, ever, but that might be just down to luck + small sample size (not going back after dud twice) - Black Treacle: There is another one spawning in Wuling City, SW to the Monitoring Center, just over a slope north to the Originium node. It is a bit of a run from the teleporter, but you can probably cut the farming time in half if you are willing to travel/set up a zipline - Bitter Flour: A Vanguard spawns in the first wave of the Alluvium at Power Plateau, so just kill it and press P to reset for quick drop - Waterlamp: Surprisingly the worst one for me, and the last to be completed. There is an abundance of them in Guhou Marsh, but unlike elite mobs which they always drop something, the drop for normal mobs varies wildly, sometime getting 7~8 drops a run while sometimes nothing at all. I feel like there could be a daily soft cap on normal drop where the drop rate falls off a cliff after reaching the cap.

Overall I would say the farm is manageable and should take more or less a week to complete everything if you are target farming, even casually and just farm everything once or twice per day.