[Edi]

The resource system is much simpler. They go by different names, but essentially all classes require some different special resources (like gems of a different path) for their specific rituals.

Rituals are class specific in the sense that they are available only to certain commanders of a certain class, but if another player charms that commander, he can use those same rituals. Charm a warlock, use elemental summonings. Charm a necromancer, gain necromancy etc.

You can't build stuff like cities, forts etc. Some classes can do some very limited terraforming (Burgmeister can change farms to Hoburg Villages, under certain circumstances anyone can burn down forests and the enchanter destroys lots of stuff to build things).