> Rot has two primary sources - Mee Vorala and hungry darkness spirits
> called(conveniently) "Rots"
>
> Mee Vorala causes fungal rots and slurries and many sorts of organic "decay" in
> addition to growing mushrooms and other more obvious manifestations. There
> are major schools of Troll cuisine (and brewery) based around the strange and
> alien magic of Mee Vorala, and her ability to transmute organic matter in
> strange and wonderful ways.
I'm sure there is an incredible diversity of explanations for why things rot. From the Brithini principle of material devolution to the Orlanthi belief that once no longer animated by the soul, the body returns to its component parts (largely Earth).
Jeff