Finish an Era with a Desert Village which has 300 Village Prosperity
There are many ways to accomplish this task but by far the easiest is through pure minerals. You want to start with Quartz, and plenty of it. Once you finish your village’s first project hoist the desert ambassador onto the Rock Giant’s shulders and then upgrade everything with potent aspects to Onyx, then apply two more potent buffs.
Keep doing this, adding new mines as your village expands, and through wealth alone you can smash this target.
Humility - don’t be afraid to punish a village for going to war. If you attack their troops with the Rock Giant or Swamp Giant, rather than the village directly, you will stop the conflict. Do this a few times and you’ll 'humble' the village, which resets their greed meter to nothing.
Obviously this method doesn’t take into account what projects will appear for you. Make sure you investigate your project specialisations as there is a high possibility that fulfilling their requirements will boost your resources throgh the roof as well.
If you are struggling with this task then consider adding plants in between Onyx nodes as activating their symbiosis can provide a nice extra hit of Wealth. Just make sure you can upgrade the plants to make them worthwhile as well…