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).
After playing Dominions 3 I expected a bit more from CoE3.
The game is quite good to do some casual gaming, but it is gravely lacking in strategy:
Besides deciding which units to buy and where to place your army on the map there is nothing else to do.
(no ressource management, you can´t even arrange your troops)
So if your up for some casual gaming give CoE3 a shot.
For strategy and challenge stick with Dom3 or any other 4x-game.