To evolve during a game you must produce resources and spend them to play Creatures, Locations, Equipment and Interventions. Each faction has a different type of resource that matches the requirements of a card’s casting cost. If you want to play a Resistance card you probably need some Jungle or Solar resources to play it, even though some cards require more than one type of resource to play. Your resources are put together as your Resource Stack including a Judgment Day card. When your stack runs out of resources your Homeland can produce no more resources. The only way to get more would be to have multiple Locations in play or have other cards allowing you to spend or produce resources. When other Locations than your Homeland come into play, they will not draw resources from your Resource Stack but from the outside realm of your stronghold.