Last Z Building Upgrade Order - HQ, Lab, and Camps
Quick Answer
Best Last Z building upgrade order: keep HQ, Laboratory, and the next required building moving. Then fix the bottleneck: Formation I for your Main Troop's ATK and DEF, your main troop Camp for its next tier, Military Center for troop capacity, Hospital when wounded capacity is too low for expected fights, or Warehouse when exposed resources repeatedly exceed its protection limit. Do not upgrade every building just to keep builders busy.
Key insight: Laboratory is mandatory from HQ8 onward, so plan HQ upgrades around Lab + prerequisite building cycles.
Shelter Progression Order (Core Loop)
Step 1: Prioritize Headquarters (HQ)
Headquarters upgrades unlock buildings and set the maximum level for both heroes and buildings, making HQ the main progression bottleneck.
Use the HQ Upgrade Guide for the roadmap, or the HQ Construction Cost Table for exact prerequisite levels and timers.
Step 2: Track HQ Prerequisites (Lab + Cycle)
From HQ8 onward, Laboratory is always required, plus a second prerequisite that rotates through City Walls, Alliance Center, and the three Camps (Assaulter, Shooter, Rider). Keep the building required by your next HQ upgrade ready to avoid a hard block; the others do not need to match HQ at every stage.
The Laboratory itself unlocks at HQ7 and is required to research technologies.
Step 3: Keep Core Resource Buildings Running
Food, wood, and electricity power construction, upgrades, and troop training. Farmhouse produces Food, Lumberyard produces Wood, and Wind Turbine produces Electricity, but early progress usually comes from HQ prerequisites, events, gathering, and rewards more than maxing production buildings.
Use the Resources Guide to balance gathering and production.
Step 4: Push Shooter Stages for Rewards and Hero XP
Shooter stages provide rewards and XP crates that level heroes, and both modes feed into each other for long-term progression.
If you want a dedicated breakdown, see Shooter Stages Guide.
Step 5: Upgrade Other Buildings by Need
Once the next HQ requirement is covered, choose the building that solves your current problem:
- Formation I: upgrade it for your Main Troop. Each level adds +1% ATK and +1% DEF to that Troop only; other Formation Buildings affect their own Troops.
- Main troop Camp: raise it when the next troop tier is your bottleneck. Keep other Camps on the HQ prerequisite path unless you use those troop types.
- Military Center: raise it when troop capacity is holding back training. Hospital: raise it before repeated fighting if wounded capacity is too low.
- Warehouse: raise it when you repeatedly carry resources above its protection limit, especially before long offline windows. Keep unused resource packs unopened until needed; see resource protection for exposed stock.
Upgrade City Walls and Alliance Center when the next HQ level requires them. Their levels do not need to match HQ at every stage.
Advanced Tips & Common Pitfalls
- Lab is mandatory: From HQ8 onward, Laboratory is always required for HQ upgrades.
- Follow the cycle: City Walls → Alliance Center → Assaulter → Shooter → Rider repeats as the second prerequisite building.
- Production Center matters: It increases gathering speed and troop load, helping both economy and marches.
- Trade Center is niche: It boosts Zent production but is generally lower priority early on.
- Lab No. 2 is optional: A second Laboratory unlocks at HQ18 but requires a Research License.
FAQ
Should every Camp and City Walls match my HQ level?
No. Keep the rotating prerequisite ready for the next HQ upgrade. Raise your main troop Camp sooner if its next tier is the bottleneck; upgrade other Camps and City Walls when a requirement or a specific need calls for them.
Which buildings are required for HQ upgrades?
From HQ8 onward, Laboratory is always required, plus a second building that cycles through City Walls, Alliance Center, and the three Camps.
Should I max resource buildings early in Last Z?
No. Keep production buildings functional, but do not overinvest early. HQ prerequisites, events, gathering, and rewards usually move progression faster than maxing Farmhouse, Lumberyard, or Wind Turbine.