Age of Wonders 3 is a turn-based fantasy 4X strategy game focused on combat rather than empire building. As such, it has more in common with Master of Magic and Heroes of Might and Magic III than with Civilizations 5.
The base game provides two different and quite long campaigns featuring branching paths and different endings, a few pre-generated scenarios, and a random map generator with a lot of map and game options to customize your games to your liking.
Multiplayer is present and alive with the possibility to play with people who own the GOG version, meaning the community is not divided.
You start a game by customizing your leader by choosing his race and class between 6 different races and 6 different races, amounting to 36 different initial combinations, with each race and class having distinct spells and characteristic, providing them different optimal gameplay while still being homogeneous enough to keep things balanced. To further specialize your leader, you can also chose between 8 specialization options, such as Water adept, Fire adept, Explorer, etc.
The game is extremely fun to play and the combat system is excellent in both concept and execution. Add to that different units and spells interacting together dynamics and you get really epic battles that never feel like they are dragging on.
Golden Realms Expansion:
The first expansion pack adds one new race, two new specializations, a new campaign, new scenarios, new units, new spells, new mechanics, and new map options, turning the game from great to amazing.