An arena for unprecedentedly accurate skill assessment – a skill test.

Why reduce the influence of the native land?

If the opponent has a unit in their army for which this land is native, the game prohibits the use of a minefield. It's an unnecessary restriction on an already rarely used spell. Sand (or wasteland) helps in this regard.

Added 4 minutes ago

Added an event for +3 morale.

The whole point of the skill test is that your units move with -3 morale.

The original version of the map was already almost perfect, IMHO. That's why it was so popular.