Last Z Field Research Guide：Unlocking Conditions & Cost Breakdown

In Last Z: Survival Shooter, Field Research is one of the most powerful late-game tech trees in the research system. It provides massive permanent boosts to troop attack, defense, training speed, and survivability — especially valuable if you run high-tier troops (T10+). Completing it also unlocks three specialized sub-trees: Shooter Training, Assaulter Training, and Rider Training, which deliver huge type-specific bonuses.

This guide covers exact unlocking requirements, total and per-node badge costs, what bonuses you get, and smart spending tips to avoid wasting resources.

Unlocking Conditions for Field Research

Field Research is a high-end branch that only appears after significant progress in other research trees. You must meet all of these prerequisites:

• New Home — 100% complete
• Elite Troops — 100% complete
• Military Strategies — at least 40% complete
• Siege to Seas (or Siege to Seize) — 100% complete

Once these are done, Field Research unlocks in your main research menu (usually under the advanced or late-game tab). There are no shortcuts — you must fully finish New Home and Elite Troops, plus the partial Military Strategies and full Siege to Seas.

Pro Tip: Many players hit a wall here because they rush Field Research too early. Focus on the prerequisite trees first for faster overall progress.

Cost Breakdown for Field Research

Field Research is extremely badge-heavy and has a very back-loaded cost curve:

• Total Badges to Fully Complete: 594,430
• First 11 Nodes: Approximately 182,930 badges (cheaper early nodes)
• Last 3 Nodes: Consume around two-thirds of the total cost (roughly 400,000+ badges combined)

The final nodes are the most expensive by far, so plan your badge savings months in advance. Dumping badges into Field Research before meeting prerequisites or before having strong badge income is a common mistake that slows your account.

Note: Costs are in Badges (the main research currency). Exact per-node costs vary slightly by server or updates, but the total of 594,430 is consistent across current guides.

What Bonuses Does Field Research Provide?

Completing Field Research gives broad troop improvements and unlocks the three specialized training trees:

• General Bonuses: Significant increases to troop attack, defense, HP, training speed, and overall survivability.
• Unlocked Sub-Trees:
• Shooter Training — Strong boosts for Shooter-type troops (damage, range, accuracy).
• Assaulter Training — Enhancements for Assaulter troops (melee/close-range power and durability).
• Rider Training — Improvements for Rider troops (mobility, charge damage, and speed).

These sub-trees are especially strong if your formation focuses on one or two troop types. The bonuses compound with other late-game research like T10 (Unit Special Training).

Smart Strategy & Spending Tips

• Priority Order: Do not start Field Research until all prerequisites are maxed. Prioritize badge-efficient trees like Shelter Building, Elite Troops, and Alliance Recognition first for faster income.
• Badge Economy: Save aggressively — Field Research + T10 (which costs ~1.4 million badges) are long-term projects. Focus on daily badge sources, alliance events, and research speed buffs.
• Queue Management: Unlock a second research lab early for parallel queues. This helps grind prerequisites faster.
• When to Invest: Ideal after you have stable T8–T10 troops and strong economy. The late nodes give the biggest power spikes but require patience.
• Avoid Common Mistakes: Don’t partially invest and abandon it — research is permanent, but wasting badges early hurts your timeline.

Field Research shines in PvP, rallies, and late-game PvE where troop quality matters most.

If you’re stuck on prerequisites, need a full tech tree priority order, or want tips for specific sub-trees (Shooter/Assaulter/Rider), provide more details about your current progress (HQ level, troop tiers, or completed researches) for targeted advice!

Mastering Last Z Field Research with its 594,430-badge investment is a major milestone that transforms your formations. Plan ahead, meet the unlock conditions, and enjoy the massive troop boosts — good luck surviving in the wasteland!