Aeromancy is divination by air. It is performed in solitude and, like Geomancy, requires that the diviner not be indoors, although he need not be on the ground. In addition, note that the hard vacuum of space is no place to divine. Air, obviously, must be present. The information gained is in the form of visions or voices.
Hydromancy is divination by water, or more specifically, the motion of water.
Normally, a brook or river is observed, but underground lakes and the like work with no skill penalty. Unlike the herbs needed for pyromancy, however, the stones may be used repeatedly. Hydromancy may be used in any setting, and does not require solitude. Miscellaneous Methods Astragyromancy is divination through reading dice marked with various symbols, numbers and letters. A reading takes 20 minutes.