Allowing you both modify default encounter rate changes and set a tile's unique encounter rate, you can now remove ship battles, make hills and forests very dangerous, or have different parts of your world map use different rates.
This script binds changes in the encounter rate to individual tiles through usage of notetags and terrain tags.
So, basically, if you are in the forest, you will run into monsters at a different rate, than like in the grass? If so.. very interesting. So, when walking through a forest, you can run into random battles a LOT more than walking on grass.. if i have that right.