Mastering the Army Building Research Tree in Last Z: Survival Shooter
Updated October 12, 2026
Optimizing Your Army Building Research in Last Z
For most players, the Army Building research tree is a significant late-game commitment, not an initial focus. Completing this entire branch costs a substantial 750,250 badges and becomes available only after your Peace Shield research is fully maxed out. It primarily offers benefits for advanced combat scaling, making sense only after you've secured value from earlier research paths.
Army Building: A Strategic Overview
This particular research path shifts badge planning from early efficiency gains to a crucial endgame decision. Its full potential is realized when you're ready to invest heavily in advanced combat capabilities.
Key Characteristics:
- Total Cost: 750,250 badges
- Prerequisite: 100% Peace Shield completion
- Primary Benefit: Enhances late-game combat effectiveness
Node Breakdown and Costs
The Army Building branch encompasses 23 nodes with a total of 255 levels. The final node in this extensive tree is Recharge Shield.
Below is a detailed table outlining each node, its level range, and the total badge cost to max it out:
| Node | Levels | Total Badges |
|---|---|---|
| Combat Policy I | Lv. 1-10 | 4,180 |
| Interceptions I | Lv. 1-10 | 4,180 |
| Field Training I | Lv. 1-10 | 4,180 |
| Camo Coating I | Lv. 1-10 | 4,180 |
| Demolition Crew | Lv. 1 | 420 |
| Alloy Plate | Lv. 1-3 | 4,160 |
| Enhanced Armour | Lv. 1-3 | 4,160 |
| Aerocraft Material | Lv. 1-3 | 4,160 |
| Mobility Enhancement | Lv. 1-10 | 24,990 |
| Melee Combat | Lv. 1-10 | 24,990 |
| Weapon Upgrading | Lv. 1-10 | 24,990 |
| Stronger Armor | Lv. 1-10 | 24,990 |
| Shield Upgrade | Lv. 1-10 | 24,990 |
| Tactical Cover | Lv. 1-10 | 24,990 |
| Joint Operation II | Lv. 1-15 | 49,990 |
| Mobile Defense II | Lv. 1-15 | 49,990 |
| Combat Policy II | Lv. 1-15 | 49,990 |
| Interceptions II | Lv. 1-15 | 49,990 |
| Field Training II | Lv. 1-15 | 49,990 |
| Camo Coating II | Lv. 1-15 | 49,990 |
| Fire Up | Lv. 1-20 | 104,130 |
| Armor Upgrade | Lv. 1-20 | 104,130 |
| Recharge Shield | Lv. 1-15 | 62,490 |
Unlocking Army Building and Its Significance
Army Building becomes available only after the Peace Shield research line is completely finished. This places it firmly in the late-game progression. It's a subsequent development, not an alternative early route. The most significant badge expenditures appear well after the initial nodes.
Consequently, Army Building is typically integrated into a long-term combat strategy, rather than being an immediate recommendation for new players.
Key Progress Milestones
As you advance through the Army Building branch, certain points represent major badge commitments:
- Initial Nodes Completed: The first eight nodes require 29,620 badges, serving as foundational steps before larger costs emerge.
- Mid-Combat Block Finished: After two sets of three combat-focused nodes, the investment grows to 179,560 badges, marking a substantial commitment.
- Second Major Wall: The repeated 15-level branches elevate the cost to 479,500 badges, solidifying its status as a late-game challenge.
- Entire Branch Completed: Reaching the final nodes like Fire Up, Armor Upgrade, and Recharge Shield brings the total to 750,250 badges, making it one of the game's more significant research endeavors.
Integrating Army Building into Your Research Plan
This branch isn't about early gains; it's about whether your account is primed for a serious late-game badge expenditure. It becomes relevant only once Peace Shield is fully researched and your high-value, earlier branches are already maxed out. If you're weighing this against even deeper research, consider comparing the costs with other advanced trees like Unit Special Training.
Quick Tips
- Late-Game Priority: Focus on Army Building only after Peace Shield is 100% complete and early-game efficiency research is done.
- Total Badge Cost: Plan for a massive 750,250 badge investment.
- Unlock Requirement: Ensure Peace Shield is fully researched to access this tree.
- Final Node: Recharge Shield is the last node, costing 62,490 badges to complete.
- Cost Comparison: While expensive, Army Building is less costly than Unit Special Training, positioning it earlier on the late-game research ladder.
- Verify Costs: Always check the in-game research screen for current node costs and unlock paths before committing resources.