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A little nitpicking: for an observer in the southern hemisphere, for example, the "desert" will be north, and the "snowy lands" will be south, so "reality" implies both options.
Regarding magic, Irdiss correctly described everything according to the elements. Nowhere was it said that it is impossible to develop non-specialized magic; rather, the opposite is true – any race will have access to any school of magic (it is not yet entirely clear with the Orcs). How exactly the races' inclination to a particular school manifests itself has not been stated. In the description of the Necromancers, it was mentioned that, in addition to their primary magic (which corresponds to their dragon), they prefer the magic of Earth and Darkness. Therefore, it may turn out that for each race, there will be one specialized magic and two non-specialized, but preferred, magics.
That is, what do we have: undead - death, humans - life, demons - fire, lizardmen - water, orcs - earth.
