Yeast

is a unique crop produced within Wall Sheena. 
== Usage ==
The yeast produced in Wall Sheena bears resemblance to a lump of fermented soybeans the size of a human head. These batches of yeast are stored in sheds or tents along with other goods such as wheat, soybeans, and dry-cured meats in order to drastically slow the rate of decomposition. 
The yeast stored with these various goods appears to transform said goods by currently scientifically unexplained means.
== References ==
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