Description[]
"Makes fine pots."
What this actually means is that you will get a few extra goods every sacred time, about 5 or so. It is unclear what effect, if any, having the Greenware Exotic Goods has on this production
Acquisition[]
Another clan will start with it. You can trade for it. It should not be possible to gain this treasure in a raid (for context, check the kiln picture here; Rider kilns are not the sort of thing you can load on your horse or even a travois while still worrying about someone shooting arrows at you); if that happens it's a bug.