Finish the Third Era with at least 1 Upgraded Great Project
The tricky part about this Development is that you’ll want to farm ambassadors first. Consider the village we will wind up working on last. If you choose forest, for example, then it makes sense to upgrade the Forest giant’s plant appropriate abilities to their full, choosing your four ambassadors in line with this (3 forest, 1 swamp) and creating initial villages to adhere to this.
So create six basic Projects (destroy a town or two once it creates a project, if you feel this would be easier than creating six separate villages) and then complete four project upgrades, and then complete four grand projects.
As long as you’re astute with your symbiosis this should come fairly easily. Remember to upgrade resource points over time as you unlock improved abilities and aspects.
When you have a few heads full of ambassadors, that is when you can turn focus on one village and work on helping it reach its potential through your most effective powers. Remember to read specializations carefully, as some can be crucial and extremely helpful in creating an upgraded great project.