Mastering the Steel Age in Last Z: Survival Shooter
Updated October 12, 2026
Mastering the Steel Age in Last Z: Survival Shooter
The Steel Age in Last Z: Survival Shooter introduces a vital progression path, enhancing your settlement's capabilities significantly. This research branch is crucial for fortifying your defenses, boosting resource output, and improving your medical facilities.
Overview of the Steel Age Branch
To fully complete the Steel Age research, players will invest a total of 1,079,410 badges across 24 distinct nodes and 145 individual levels. This branch focuses on key areas such as the Steel Plant, production bonuses, healing efficiencies, construction and research acceleration, and increasing reservist capacity.
Unlocking the Steel Age
To begin your journey into the Steel Age, your Laboratory building must reach Level 30. This prerequisite ensures your base is adequately developed to handle the advanced technologies presented in this tree.
The Steel Age Research Tree Explained
The research tree is structured with clear connections, where unlocking certain technologies is a prerequisite for others. Each node in the table below details the full badge cost to reach its maximum level within this branch.
| Node Name | Levels | Total Badges |
|---|---|---|
| Steel Plant | Lv. 1 | 2,580 |
| Farming Technology | Lv. 1-5 | 5,160 |
| Woodcutter | Lv. 1-5 | 5,160 |
| House Renovation | Lv. 1-5 | 20,600 |
| Smelting | Lv. 1-5 | 20,600 |
| Wind Drive I | Lv. 1-5 | 30,920 |
| Production Boost | Lv. 1 | 5,150 |
| Emergency Center | Lv. 1 | 5,150 |
| Rapid Casualty Care | Lv. 1-10 | 25,770 |
| Critical Care Bed | Lv. 1-10 | 25,770 |
| Skillful Craftsman I | Lv. 1-10 | 51,510 |
| Parallel Work I | Lv. 1-10 | 51,510 |
| Rapid Casualty Care | Lv. 1-10 | 77,290 |
| Critical Care Bed | Lv. 1-10 | 77,290 |
| Production Boost | Lv. 1 | 20,610 |
| Farming Technology | Lv. 1-5 | 77,280 |
| Woodcutter | Lv. 1-5 | 77,280 |
| House Renovation | Lv. 1-5 | 77,280 |
| Smelting | Lv. 1-5 | 77,280 |
| Wind Drive I | Lv. 1-5 | 77,280 |
| Reservist Camp | Lv. 1 | 36,070 |
| Rapid Casualty Care | Lv. 1-10 | 77,290 |
| Critical Care Bed | Lv. 1-10 | 77,290 |
| Combat Readiness | Lv. 1-10 | 77,290 |
Significant Badge Investments
Some nodes demand a substantial badge commitment. The two most costly individual nodes within the Steel Age are:
- Rapid Casualty Care (Lv. 1-10): Requires 77,290 badges.
- Critical Care Bed (Lv. 1-10): Requires 77,290 badges.
These figures represent the full cost for these specific nodes, not including any prerequisite technologies.
Quick Tips
- Prioritize upgrading your Laboratory to Level 30 early to access this branch.
- Focus on production-boosting nodes like Farming Technology, Woodcutter, and Smelting to sustain your base.
- Invest in healing advancements such as Rapid Casualty Care and Critical Care Bed to keep your troops healthy.
- Remember, the total badge cost listed here is specifically for the Steel Age branch and does not include earlier research or building upgrades.
- Carefully plan your badge spending, especially for the high-cost healing nodes.