Eras, ranked
The three progression eras ranked by survival pressure and progression yield. The Industrial Phase sits at S+ for the Bonfire Level 5 apex and Day 100 trigger.
S+
1 entries
Titanium apex, automation unlocks, Day 100 trigger.
A
1 entries
Metallurgical bottleneck; bridges scavenger and industrial phases.
B
1 entries
Foundation-laying era; necessary but mechanically straightforward.