SearchSilt
Denizens of Zalanthas have a multitude of terms for sand, grit, and dust, and silt falls within that vocabulary. An ashy residue, it is found in vast lakes in the south, forming the perilous Sea of Silt, where few dare travel.
No one lives too close to the Sea of Silt, because of silt's ill effects on the body: it chokes the lungs, clouds the eyes, fills the nose and mouth, and at times exhibits mildly hallucinatory qualities.
The presence of silt also has an odd effect on many magicks, causing them either to become more powerful or fizzle completely in unpredictable ways.