Tiers of Technological Achievement

Tier 0: Transient

Tier 1: World Builders (Forerunner)

Tier 2: Interstellar (Covenant)

Tier 3: Space-Faring (Human)

Tier 4: Space Age (Humans c. 2000 CE)

Tier 5: Atomic Age (Humans c. 1940 CE)

Tier 6: Industrial Age (Humans c. 1600 CE)

Tier 7: Preindustrial (Humans c. 0 CE)