Conquest of Elysium 3 is an old school fantasy strategy game. You explore your surroundings conquer locations that provides the resources you need. Resources needed vary much depending on what character you are, e.g. the high priestess need places where she can gather human sacrifices, the baron needs places where tax can be collected and where iron can be mined. These resources can then be used for magic rituals and troop recruitments. The main differentiator for this game is the amount of features and special abilities that can be used.
The game can be played on Windows, Linux (x86 and raspberry pi) and Mac OSX (intel and powerpc).
A substantial army led by a Dark Mage sweeps into undefended territory to start taking resources. The opponent was a Knight-level Baron AI, and he ended up winning.