Disciples: Sacred Lands
Here is my fan page for Strategy First's TBS, series, Disciples, primarily the first game in the series (Sacred Lands). There is also a second game in the series (which I have played a little) and a third one (which I don't have). The games take place in a dark fantasy world where the various races wage holy wars at the behest of their quarreling gods, and feature a mechanic where each race transforms the land into their preferred environment by influence from the cities they claim or by having a special unit plant magical rods to stake claims on a particular area. There are also some light RPG elements where leaders and units can level up, use items and powerups, and raid dungeons for treasure. The battle system is also RPG-like.