Finish an Era with 2000 Wealth in Use from Villages
The resources we want to create to complete this development are Onyx (combined with shrubs), one Gold, and a host of wealth generating animals. To this end the focus of the Ambassador Farm should be to equip the Rock Giant with 3 Desert Ambassadors and 1 from any biome, and to get the Desert Giant set up with 2 Desert, 1 Swamp, and 1 ambassador from any group.
With these ambassadors claimed turn your attention to spreading and nurturing a Desert biome.
Put a lot of attention on your minerals and the Rock Giant’s Noble Aspect. Doing this will guarantee a lot of wealth in the world, and spreading them all over the world - alongside the Swamp Giant’s animals - you’ll generate a lot of wealth fairly quickly.