Last War Zombie Invasion Guide: Bosses, Courage Medals and Strategy

Zombie Invasion in Last War is a recurring world-map event built around hunting golden Invading Zombies, spawning Zombie Bosses, joining alliance rallies, and collecting Courage Medals for a limited event store. It is particularly useful for farming Gold and other resources while also providing Drone materials, progression items, and leaderboard rewards.

The most efficient strategy is to save stamina before the event, kill Invading Zombies to generate resources and potential Boss spawns, then join as many alliance Zombie Boss rallies as possible. Players who want to push damage or accelerate Boss progression can also launch rallies, while more stamina-conscious players can focus heavily on joining rallies without paying the rally leader’s stamina cost.

How Zombie Invasion Works

Zombie Invasion typically returns on a recurring event rotation. Current versions commonly run from Wednesday through Friday on a roughly two-week cycle, although server schedules and future event rotations can change. Always use the Event Center countdown on your server as the final schedule.

Two main enemies appear during the event:

Enemy	How It Works	Main Purpose
Invading Zombie	Golden zombies appear in waves across the World Map	Farm resources and Courage Medals while attempting to discover Zombie Bosses
Zombie Boss	Can appear after an Invading Zombie is defeated	Fight through alliance rallies for larger rewards and event progress

The event page shows a countdown toward upcoming Invading Zombie waves. On the map, smaller golden skull markers indicate regular Invading Zombies, while larger golden markers identify Zombie Bosses.

Invading Zombies Explained

Invading Zombies are the foundation of the event. They appear in groups across the map and can also be located through the Zombie Invasion interface.

Under the standard event format, attacking an Invading Zombie costs 10 stamina. These enemies are Level 10 and provide the same basic event reward structure regardless of where they appear.

Defeating one gives resources and 10 Courage Medals. More importantly, each kill has a chance to discover a Zombie Boss.

There Is No Fixed Number of Zombies Required to Spawn a Boss

Zombie Boss discovery is chance-based. Killing five, ten, or another specific number of Invading Zombies does not guarantee that a Boss will appear.

This means stamina preparation matters. The more Invading Zombies you can efficiently defeat during the event, the more opportunities you create to discover Bosses while also collecting the guaranteed rewards from the smaller enemies.

Zombie Bosses and Alliance Rallies

Zombie Bosses are much stronger than regular Invading Zombies and are designed to be fought through alliance rallies. Higher-level Bosses become harder to defeat while providing better resource rewards.

There are three useful roles during the Boss cycle:

Boss Discoverer

If one of your Invading Zombie kills discovers a Boss, that Boss is registered to you. When it is eventually defeated, the discoverer receives an additional reward through in-game mail even if another player leads the successful rally.

Newly discovered Bosses also have an initial protection period during which the discoverer’s alliance has exclusive access. Under the current format, this protection lasts 10 minutes.

Rally Leader

Starting a Zombie Boss rally currently costs 20 stamina. Rally leaders can actively push Boss kills and are particularly useful when your alliance is trying to clear stronger Bosses or improve event damage.

Leading every rally yourself is expensive, however. Players with limited stamina should mix Boss rally leadership with joining other members’ rallies.

Rally Participant

Joining another player’s Zombie Boss rally does not normally consume your stamina. This makes rally participation one of the most efficient ways to collect additional event resources and Courage Medals.

How Zombie Boss Levels Work

Zombie Boss levels are influenced by a personal Summoning Level. As your Boss progression advances, the event can begin generating stronger Bosses around that level.

The current rule structure uses a potential Boss range extending below and slightly above your Summoning Level. Your Summoning Level can rise when higher-level Bosses connected to your progression are defeated, and leading successful fights against qualifying Bosses can also advance it during an event.

This progression carries forward rather than simply resetting to the lowest Boss level every time Zombie Invasion returns.

Boss spawning behavior has changed over the game’s lifecycle and can behave differently across server stages. If the Boss levels appearing for you do not match older examples, use your current event interface and recent Boss history rather than assuming your account is bugged.

How to Find Zombie Bosses Faster

When the event is active, speed matters because many alliances are hunting Bosses simultaneously.

• Use the Zombie Invasion event page: Check your personal and alliance discoveries rather than relying entirely on manual map searching.
• Watch alliance rally notifications: Join suitable rallies as soon as they appear.
• Zoom out when searching manually: Large golden Boss markers are easier to identify from a wider map view.
• Stay near active alliance members: A busy alliance generates more Boss discoveries and rally opportunities.
• Respect server rules: The game provides an initial alliance protection period, but individual servers may also use additional agreements regarding another alliance’s Bosses.

Courage Medals and the Zombie Invasion Store

Courage Medals are the event currency. You earn them through Invading Zombies, Zombie Bosses, and related event rewards, then exchange them in the Zombie Invasion Trade Store.

The available store inventory expands as servers progress. Depending on your server age, items can include:

• Stamina
• Universal Exclusive Weapon Shards
• Drone Parts
• Drone Component Chests
• Skill Chip Chests
• Hero Recruitment Tickets
• Survivor Recruitment Tickets
• Valor Badges
• Research and construction speedups
• Gold, Food, and Iron chests
• Seasonal progression materials such as Oil
• Overlord-related materials on servers where that system is available

Courage Medals cannot normally be purchased directly. They are earned through participation in Zombie Invasion.

What Should You Buy First?

The best purchase depends on your account’s current bottleneck, but limited long-term progression materials usually deserve consideration before ordinary resource chests.

A practical approach is:

1. Check limited high-value progression items. Exclusive Weapon materials, Drone progression items, Skill Chips, or newer server-specific materials can be difficult to obtain elsewhere.
2. Consider the cheap stamina supply. Extra stamina can be useful because it can be recycled into more Invading Zombie attacks while the event is still active.
3. Buy items tied to your current development goal. Do not spend heavily on a system you will not use for months.
4. Use excess medals on resources and speedups. These remain useful once your higher-priority limited purchases are handled.

Store inventory changes as servers age, so a purchase priority written for an early server may not fit a later account with Exclusive Weapons, advanced Drone systems, Oil research, or Overlord progression.

Zombie Invasion Leaderboard

Combat during Zombie Invasion also contributes toward an event leaderboard. Players dealing more qualifying damage can earn additional ranking rewards when the event concludes.

Joining rallies is excellent for efficient resource farming, but players actively pursuing the leaderboard need enough strong combat participation to produce meaningful damage rather than relying entirely on passive rally joining.

For most players, however, ranking should remain secondary to stamina efficiency, Courage Medals, Boss discoveries, and reliable resource farming. Spending a large stamina reserve simply to chase a temporary rank can leave you short for other events.

Why Zombie Invasion Is Good for Gold Farming

Zombie Invasion is particularly useful when your account begins consuming large amounts of Gold for research and other progression systems.

Both Invading Zombies and Zombie Bosses provide resources, and higher-level Boss participation can generate increasingly useful payouts. Since joining alliance Boss rallies can be done without the stamina cost of starting the rally yourself, an active alliance can dramatically increase how many event rewards you collect.

This makes alliance activity one of the event’s biggest advantages. A player in an alliance running constant Boss rallies has far more opportunities than someone attempting to farm the event almost entirely alone.

Best Zombie Invasion Preparation

Save Stamina Before the Event

Do not enter Zombie Invasion with an empty stamina reserve if resource farming is a priority. Stamina items let you kill more Invading Zombies, which means more guaranteed rewards and more opportunities to discover Bosses.

Keep Your Main PvE Formation Ready

Use your strongest developed formation for difficult Zombie Boss rallies. Higher Boss levels eventually become demanding enough that weak rally leaders may fail even with multiple participants.

Coordinate With Your Alliance

More active members mean more Invading Zombie kills, more Boss discoveries, and more rallies for everyone to join. Alliance communication also prevents several players from opening unnecessary competing rallies while existing Boss rallies remain unfilled.

Check Hospital Capacity

Players leading demanding Boss rallies should pay attention to wounded troops and avoid accumulating unnecessary losses while farming aggressively.

Zombie Invasion After Season 2: Glacieradon

On servers that have progressed beyond Season 2, Zombie Invasion can expand with an alliance challenge involving Glacieradon.

Defeating Zombie Bosses contributes Glacieradon points to the alliance. Once enough progress has been accumulated, an R4 or R5 can activate the Glacieradon challenge.

How Glacieradon Works

• The alliance can start the Glacieradon challenge once during the event.
• The challenge lasts 60 minutes.
• Each Commander can attack Glacieradon up to 30 times during the event.
• Successful attacks reduce its shared HP and grant attack rewards.
• Glacieradon periodically launches ice attacks that freeze Commander bases.
• A frozen base cannot relocate or participate normally in rallies while the freeze is active.
• Defeating Glacieradon drops treasure that can be collected for additional rewards.
• The alliance receives an additional result reward after the challenge.

Glacieradon leaves before the main Zombie Invasion event fully ends, so alliance leadership should not postpone activation until the final moments. Server progression can affect when this version of Zombie Invasion first appears.

Best Zombie Invasion Routine

1. Enter the event with saved stamina.
2. Kill Invading Zombies whenever new waves appear.
3. Track any Zombie Bosses you discover.
4. Join active alliance Boss rallies whenever a useful slot is available.
5. Launch rallies when additional Boss-clearing capacity is needed.
6. Continue farming Invading Zombies between rallies.
7. Check Courage Medal totals and store inventory regularly.
8. Buy limited progression materials before spending heavily on common resources.
9. On advanced servers, help the alliance accumulate Glacieradon progress.
10. Make sure leadership starts Glacieradon with enough time to complete the challenge.

Common Zombie Invasion Mistakes

• Starting with no stamina: This severely limits how many Invading Zombies you can farm.
• Launching every Boss rally yourself: Joining allies is much more stamina-efficient.
• Ignoring small Invading Zombies: They provide guaranteed rewards and are the source of new Boss discoveries.
• Expecting a Boss after a fixed number of kills: Boss discovery is chance-based.
• Ignoring discovery rewards: A Boss you find can still reward you when another player eventually defeats it.
• Fighting Boss levels your alliance cannot clear: Higher rewards mean little if the rally repeatedly fails.
• Spending Courage Medals without checking the full store: Later server progression can unlock more valuable limited items.
• Chasing ranking at any cost: Do not exhaust resources needed for other important events simply for leaderboard position.
• Missing Glacieradon on advanced servers: The alliance challenge has its own timing and activation rules.

Optional Faster Starting Point

Players who prefer starting with more developed heroes, troops, and progression systems can browse Last War accounts for sale on Heaven Guardian. When comparing accounts, check the main formation, Drone development, Headquarters progression, server stage, and alliance situation rather than relying only on total displayed power.

FAQs

How often does Zombie Invasion happen?

The standard schedule commonly returns approximately every two weeks and runs from Wednesday through Friday. Event rotations can change, so confirm the current dates in your Event Center.

How much stamina does an Invading Zombie cost?

Attacking a standard Invading Zombie costs 10 stamina under the current event format.

How do you spawn a Zombie Boss?

Zombie Bosses can appear randomly after an Invading Zombie is defeated. There is no fixed number of Invading Zombie kills that guarantees a Boss spawn.

Do you need a rally for Zombie Bosses?

Yes. Zombie Bosses are designed to be defeated through alliance rallies rather than ordinary solo attacks.

Does joining a Zombie Boss rally cost stamina?

Joining another player’s rally normally costs no stamina, while launching a Zombie Boss rally costs stamina. This makes joining rallies particularly efficient for repeated farming.

What happens if someone else kills a Zombie Boss I discovered?

You still receive the discoverer’s additional reward when that Boss is defeated, even if another Commander or rally delivers the kill.

What are Courage Medals used for?

Courage Medals are exchanged in the Zombie Invasion Trade Store for limited progression items, stamina, Drone resources, recruitment items, resources, speedups, and other rewards available at your server stage.

Do Courage Medals need to be spent immediately?

The event currency is associated with the recurring Zombie Invasion store, but inventory and available items can change as your server progresses. Check the current event rules and upcoming needs before spending a large balance.

What is Glacieradon?

Glacieradon is an additional alliance challenge added to Zombie Invasion on sufficiently progressed servers. Alliances earn progress by defeating Zombie Bosses, after which R4 or R5 leadership can launch a timed fight against Glacieradon.

What is the best strategy for Zombie Invasion?

Save stamina, repeatedly kill Invading Zombies, join alliance Boss rallies whenever possible, launch rallies selectively, and prioritize useful limited items in the Courage Medal store. Active alliances gain the most value because members continuously create new Boss and rally opportunities for each other.

Conclusion

The Last War Zombie Invasion is one of the better recurring events for combining normal PvE activity with Gold farming, Courage Medals, Drone resources, and other progression rewards. Spend stamina on Invading Zombies, take advantage of every useful Zombie Boss rally, and avoid wasting energy by launching rallies when you could efficiently join one already forming.

As your server advances, pay attention to changing Trade Store inventory, higher Boss progression, and the Glacieradon alliance challenge. Good stamina preparation and an active alliance make a much larger difference than simply trying to defeat the highest possible Boss.

For more event walkthroughs, alliance strategies, and progression advice, explore our additional Last War Survival guides.