NPC: A corrosive mist
Long Desc: A strange corrosive mist wavers in and out of solidity here.

This strange mist appears to be made entirely of evaporated acid.  The
sheer amount of corrosive power coming from it is enough to make your skin
start to peel away.  Every so often it blinks completely out of reality and
fades slowly back in.  One can only imagine what sort of magic this being
contains to accomplish such a feat.  Nearby rocks slowly seem to melt before
this beings presence.
It is a mist approximately 50'0" tall.

This NPC can be found in: Great Alyrian Underground.