1) Why do we need resources and how to get them?
The game features resources such as food, wood, iron and stone.
All of them are needed to build and improve buildings in the city, study research, hire marshals and train troops.
A certain amount of each resource is produced hourly; this volume depends on the level of the corresponding resource buildings built in the city (Farms, Sawmills, Mine and Quarries).
2) What are crystals for and how to get them?
Crystals are the in-game currency. It can be obtained in exchange for real money, for moving to a new level in the game, for obtaining achievements and completing tasks (quests).
3) What is mana for and how to get it?
Mana is the magical energy that the Altar produces. You can use it while casting spells.