A building represents a collection of facilities scattered across a world that create jobs that generate different kinds of resources. Buildings can be added using the Building ID and the effect add_building = command.
Relics are very powerful artifacts and trophies that an empire can collect if they defeat a crisis or own the required DLC. Relics can be added using the add_relic command with the corresponding relic ID.
Resources can vary from fairly common food crops to very rare substances such as dark matter and also abstract concepts such as influence and research. Resources can be added using the resource command.