Resources
Players rely heavily on natural and found resources: lumber from trees, leather from animals, grass, scrap materials and rare objects of the lost modern civilization.
Constantly changing resources can be renewed or depleted.
Availability dependent on season and weather conditions.
Resources can be claimed by tribes.
A large variety of resources with individual properties. Different woods, cloths and metals have properties that affect crafted items.
Scavenged items such as books can introduce knowledge of new crafts and skills.