Last Z Tech Tree Research Guide: The Only Upgrade Order You'll Ever Need

 

So you've just built your Laboratory, you're staring at this massive web of research nodes, and you have absolutely no idea where to start. Sound familiar?

Welcome to the club. Research is one of the few systems in this game that's permanently irreversible. Every node you unlock stays unlocked. Every day you spend grinding the wrong tree is a day of lost compounding that you can never, ever get back . So yeah, getting this right matters.

This guide is going to walk you through exactly what to upgrade first, what to save for later, and how to structure your research path so you're not out here wasting resources like half the players on your server.

How Research Actually Works

Before we dive into the order, let's get the basics straight. You do your research in the Laboratory—you start with one lab, and trust me on this, you want the second one as soon as you can afford it .

Early nodes cost basic resources: Electricity, Zents, Food, Wood. Later combat-focused trees require Badges—the premium currency you get from daily quests, alliance contributions, events like Lucky Discounter, and Alliance Duel rankings .

Every node has a timer. That timer gets shorter as you level up your Shelter Building research. And once you unlock a node? It's yours forever. So plan carefully, because badge traps are real .

 

The No-Badge Trees

Priority I: Shelter Building (Max This First)

If you take one thing away from this guide, let it be this: max Shelter Building before touching anything else that costs badges.

Why? Because Shelter Building gives you:

- Up to +30% construction speed

- Up to +10% research speed

That's not just a nice little bonus—it's a multiplier on *every single upgrade and research node* you run from this point forward. Every HQ push, every camp upgrade, every Laboratory tier runs faster because you maxed this first. The player who skips this and jumps straight to badge trees? They have permanently slower build timers on everything that follows. Not just now, for the lifetime of the account .

Max this tree completely. It unlocks HQ Management, which unlocks Rapid Growth. Yes, those are free too.

Priority II: HQ Management → Rapid Growth (Still No Badges)

Once Shelter Building is done, you'll see HQ Management pop up in your tech tree. Max it. Then Rapid Growth unlocks. Max that too .

Neither of these costs badges. Both deliver solid mid-game value—reduced upgrade timers, better building efficiency, faster queue turnover. This whole chain is one of the cleanest return-on-time investments in the entire game.

Pro tip for two-lab players: Dedicate Lab 1 to cycling Shelter → HQ Management → Rapid Growth continuously. Let Lab 2 handle the badge trees on event timing. This split keeps your momentum going without burning resources .

Priority III: Elite Troops + Allied Troops (Run These in Parallel)

Alright, now we're talking about actual combat power.

Elite Troops is hands-down one of the best-value research trees in Last Z . Unlike Assembly Tech that only buffs one troop type at a time, Elite Troops gives you universal training speed bonuses across Assaulters, Riders, AND Shooters simultaneously. And it unlocks promotions for all three.

No badges required. Every troop queue you run from now on is faster. For alliance leaders out there, training speed directly determines war readiness and how fast you recover after losses. This is not optional .

Allied Troops runs alongside it—incremental HP, defense, and attack across your squad. Not as critical as Elite Troops, but zero badges and solid passive value. If you have two labs, run them parallel. If you only have one lab, hit Elite Troops first, then circle back .

 

Your First Badge Investment: Alliance Recognition

Okay, you've built your foundation. Now it's time to spend those badges you've been hoarding. And the destination is Alliance Recognition .

This tree is expensive. But the return justifies it entirely.

Here's what Alliance Recognition gives you:

- Massive stat boosts

- Direct contribution to Alliance Duel points

- Unlocks monthly ranking rewards—including up to 10,000 badges for top-tier placements

Wait, read that again. This tree both *costs* badges and *generates* them at competitive levels. No other badge tree has this return structure .

The key nodes to know:

- Premium Rewards (1,200 badges): Unlocks chests 4, 5, and 6 in daily Alliance Duel rewards. Without this, even if you score 6 million points, you're stuck with only the first 3 chests .

- Event Expert (18,210 badges total): Gives +100% to all event points. Rush this first .

- Super Rewards (4,100 badges): Unlocks chests 7, 8, and 9—the best rewards .

- One More (20,500 badges): The grand finale. Doubles your daily Alliance Duel chest rewards .

When to Research Alliance Recognition

Here's the secret sauce: time your research completions to Alliance Duel Day 3 (Bednest Day) . Finishing high-cost nodes during the ranking window earns you event points AND badge rewards simultaneously. Don't start expensive nodes mid-week with no event scheduled—hold the timer, start it so it completes during the Duel window .

If you're an R4 or R5, coordinate with your alliance council. Multiple leaders pushing Alliance Recognition during the same Duel window compounds the alliance's collective score .

The Other Badge Trees

Once Alliance Recognition is in a strong position, you can start rotating through the other badge trees. The principle here is simple: go for the lowest badge cost per node first, and rotate based on what events are active.

Hero Training

This is a solid starting point. It adds passive stat bonuses across your entire hero lineup and strengthens your core team in all content modes. But here's the catch: only go up to the Cockpit node. Deeper levels are badge traps with poor value . Get the early power spike, then move on.

Military Strategies

This tree delivers meaningful troop combat buffs and includes the Destruction Value nodes—critical for State Ruler event scoring . If State Ruler is active or approaching on your server, prioritize this over the other two.

Also, at 45% completion, Military Strategies unlocks Peace Shield . And inside Peace Shield is arguably the second most important research in the game...

Peace Shield → Urgent Rescue

Urgent Rescue prevents troop death by an extra 20% in all scenarios. It's extremely cheap to research, and it completely counters the much more expensive Annihilation research that lets other players boost their kill potential .

Without Urgent Rescue, you will be losing SO many more troops when attacking HQs, defending attacks, or going tank vs. tank against players who have Annihilation. Get this as soon as possible .

Fully Armed Alliance

This is your luxury late-game tree. It increases hospital capacity (critical when you're being targeted), adds troop attack and defense, and unlocks Annihilation—the node that causes enemy troops to die outright instead of being wounded in PvP .

On Enemy Buster days, Annihilation changes the math entirely. But work toward this only after your other core badge trees are in good shape .

 

The Second Lab: Get It Before You Think You Need It

I mentioned this earlier, but it deserves its own section. The second research lab is one of the highest-leverage early investments you can make . Two queues means your research compounds at double the rate.

The optimal split:

- Lab 1: Runs the fast, badge-free trees continuously (Shelter Building, HQ Management, Rapid Growth, Elite Troops, Allied Troops)

- Lab 2: Reserved for badge-heavy trees, timed to event windows (Alliance Recognition, Hero Training, Military Strategies, Fully Armed Alliance)

Two queues with no strategy is just burning faster. Two queues with event-aligned timing is how serious accounts compound their research investment correctly .

 

Event Timing

The Last Z event calendar and your research queue should be the same plan, not two separate things .

- Alliance Duel (Day 3 / Bednest Day): Complete your highest badge-cost research nodes here. Research completions generate Duel points. Finishing Alliance Recognition nodes during this window earns points AND badge rewards at the same time .

- Full Preparedness: Three completions per day. If you're burning speed-ups to finish research nodes anyway, align those completions with this event—the points stack directly .

- State Ruler: Military Strategies' Destruction Value nodes are specifically valuable here. Unlock them before this event, not during it .

Players who treat the event calendar as their research spending calendar get double value from the same badge investment. Players who don't lose half the return .

 

The Hero That Makes This All Easier: Chinatsu

Quick detour because this is too important to skip. Chinatsu (Guard of Order faction) provides a massive boost to Alliance Duel points through her third skill .

At max stars, she gives a 55% bonus to Alliance Duel points. Early on, this is the single biggest boost you can get. And here's the best part: she's easy to get—just use hero shop tickets to unlock her for free . Many top alliances actually require members to have Chinatsu unlocked and skilled up.

So before you go deep into Alliance Recognition, make sure you've got Chinatsu in your roster. She makes every badge you spend on that tree work harder.

 

Common Mistakes to Avoid

Let me save you from the pain I see players go through every day:

1. Maxing Hero Training past Cockpit. Just don't. The later nodes are badge traps .

2. Rushing full Alliance Recognition early. You want the chest unlocks and point multipliers, but don't burn everything on the final nodes before your foundation is solid .

3. Dumping badges into Field Research or T10 before prerequisites. These are massive end-game trees—Field Research alone costs about 594,430 badges, and T10 (Unit Special Training) runs around 1.4 million badges . You need months of planning for these.

4. Starting expensive nodes outside event windows. Every badge spent outside an event window is a badge that didn't earn you ranking rewards .

5. Ignoring the second lab. Two queues with a plan beats one queue any day .

 

Final Thoughts

Research in Last Z isn't complicated once you know the path. Build your foundation with the no-badge trees. Get Alliance Recognition rolling and time those completions to Alliance Duel. Hit Peace Shield and Urgent Rescue early—they'll save your troops more times than you can count. And treat Field Research and T10 as the long-term projects they are.

The players who grow fastest in this game aren't always the ones spending the most. They're the ones running both labs with a plan, aligning their research with events, and making every badge count .

Now go open your Laboratory, queue up Shelter Building, and watch everything start to accelerate.

Happy surviving, and may your alliance claim that Diamond League spot. 🧟‍♂️