Because humans have discovered replication technology, making advanced use of rapid prototyping and nanotechnology, only two types of resources are required to wage war: Energy and Mass.[1] Energy is obtained by constructing power generators on any solid surface, while Mass is obtained either by placing mass extractors on limited mass deposit spots or by building mass fabricators to convert energy into mass. Constructor units can gather energy by "reclaiming" it from organic debris such as trees and mass from rocks and wrecked units. Each player has a certain amount of resource storage, which can be expanded by the construction of storage structures.