The cyst-like growths that form on a gray render are called popplers. Each one grows to about the size of a human fist and contains a developing larvae as well as a buttery yolk that is highly prized for culinary uses.
Either removed by a bonded humanoid, or removed from a slain render, the popplers remain usable for up to seven days before spoiling or forming a larvae.
Fresh popplers are highly valuable and can fetch up to 10 gold each on the open market in some countries. In Findle gray renders are seen as a dangerous and unpredictable plague. Previous failed attempts to farm gray renders have resulted in ownership of Gray Renders and the render poppler trade to be prohibited.