Season 1: The Crimson Plague is one of the biggest turning points in Last War: Survival. It changes the way players fight zombies, expand alliance territory, manage resources, and prepare for cross-server competition.

Instead of only building your base and upgrading heroes, Season 1 adds new systems like Virus Resistance, Immune Protein, Mutant Crystals, Gene Fragments, infected enemies, Military Strongholds, City capture, seasonal rewards, and exclusive hero weapons.

This Last War Survival Season 1 Crimson Plague guide gives you a full beginner-friendly overview of how Season 1 works, what to prioritize first, and what mistakes to avoid so you do not waste resources during the season.

What Is Season 1: The Crimson Plague? 🦠

Season 1: The Crimson Plague is the first major seasonal expansion in Last War: Survival. It introduces a virus-infected world where players need to build resistance, fight stronger enemies, and work closely with their alliance.

The biggest change is that raw power is no longer enough. Even if your squad is strong, you can still struggle if your Virus Resistance is too low. This means players must balance normal base progression with seasonal buildings and resources.

Season 1 mainly focuses on:

Feature	What It Does
Virus Resistance	Helps you fight infected enemies and avoid heavy debuffs
Immune Protein	Used for Virus Research Institute and some seasonal upgrades
Mutant Crystal	Used for Protein Farms and Military Bases
Gene Fragments	Used for Genetic Recombination and rewards
Military Strongholds	Alliance territory expansion points
Cities	Major alliance objectives that give influence and rewards
Exclusive Weapons	New hero weapon upgrades for legendary heroes
Season Rewards	Alliance and warzone rewards based on progress

For beginners, the most important thing to understand is simple: Season 1 rewards active players and organized alliances. If your alliance is inactive, you may miss many rewards and fall behind in map control.

Season 1 Timeline and Duration 📅

Season 1 is divided into several phases. Each phase unlocks new features, events, and alliance objectives.

Phase	Duration	Main Focus
Pre-Season	2 weeks	Preview, preparation, grouping, early setup
Main Season	8 weeks	Virus mechanics, map expansion, city capture, rewards
Celebration Phase	Varies	Final rewards and season wrap-up

During the Pre-Season, players can preview the season, check grouping information, and prepare for the new mechanics. Once the main season begins, the real progression starts.

The Season 1 event icon usually appears near your regular event icons. This is where you can access the timeline, missions, rewards, and season goals.

Season 1 City Unlock Schedule

Cities do not all open at the same time. Higher-level cities unlock later during the season.

Season Day	City Unlock
Day 4	Level 1 Cities
Day 7	Level 2 Cities
Day 11	Level 3 Cities
Day 14	Level 4 Cities
Day 18	Level 5 Cities
Day 21	Level 6 Cities
Day 28	City of Apocalypse / Capitol

This schedule is very important for alliance leaders. Your alliance needs to plan territory expansion early so you are connected to the right cities when they unlock.

What to Do During Pre-Season ✅

The 2-week Pre-Season is mostly a preparation phase. You may not have many things to do yet, but it is still important because it gives your alliance time to plan.

During Pre-Season, you should:

• Check which warzones are grouped with your server.
• Talk with your alliance about Season 1 strategy.
• Save useful resources and speedups.
• Prepare stamina for early zombie and event farming.
• Make sure you are in an active alliance before the season starts.
• Learn the new resources and Virus Resistance system.
• Avoid wasting hero resources if you are unsure about upcoming upgrades.

Best Pre-Season Preparation Tips

Your biggest goal before Season 1 starts is to be in the right alliance. Season 1 has many alliance-based rewards, and inactive alliances will struggle to capture Strongholds and Cities.

If your current alliance is not active, this is the time to think carefully. A strong alliance can help you get better rewards, more territory, faster healing, and better protection during cross-server conflict.

New Season 1 Resources 💎

Season 1 adds three important resources: Immune Protein, Mutant Crystal, and Gene Fragments. These resources are required for seasonal buildings, resistance progress, and rewards.

Resource	Main Use	Why It Matters
Immune Protein	Upgrade Virus Research Institute and Military Bases	Needed to increase Virus Resistance
Mutant Crystal	Upgrade Protein Farms and Military Bases	Needed for seasonal economy and hero-type bonuses
Gene Fragments	Genetic Recombination and rewards	Helps generate additional seasonal rewards

Immune Protein

Immune Protein is one of the most important resources in Season 1 because it helps you upgrade the Virus Research Institute. This building increases your Virus Resistance, which affects your ability to fight infected enemies safely.

You can usually get Immune Protein from:

• Protein Farms
• First-time zombie kill rewards
• Season goals
• Certain recruitment or event rewards
• Season-related reward systems

Because Immune Protein is connected to Virus Resistance, do not spend it carelessly. Early in the season, your first priority should usually be improving your Virus Research Institute.

Mutant Crystal

Mutant Crystal is mainly used to upgrade Protein Farms and Military Bases. Since Protein Farms produce Immune Protein, Mutant Crystals indirectly help you improve Virus Resistance faster.

You can usually get Mutant Crystals from:

• First-time zombie kill rewards
• Season quests
• Season goals
• Doom Walker first-kill rewards
• Genetic Recombination
• Season Battle Pass or Weekly Pass rewards
• Certain recruitment or event rewards

Mutant Crystals are very valuable early because they help upgrade your Protein Farms. Better Protein Farms mean more Immune Protein over time.

Gene Fragments

Gene Fragments are used in Genetic Recombination. There are multiple fragment types, and they can be exchanged with alliance members.

You can usually get Gene Fragments from:

• Radar missions
• Crimson Zombies
• Infected Zombies
• Doom Elites
• Curing allies
• City attacks
• Season activities

Gene Fragments are a good reason to stay active with your alliance. Curing allies can also reward certain fragment types, so helping infected teammates is useful for both sides.

Virus Resistance Explained 🛡️

Virus Resistance is one of the most important systems in Last War Survival Season 1. It determines how safely your troops can fight infected enemies and participate in seasonal map content.

If your Virus Resistance is too low, your troops can get infected. You may also deal reduced damage against certain enemies, making fights much harder than expected.

Virus Resistance Situation	What Happens
Resistance is high enough	You can fight more safely
Resistance is too low	You may get infected and suffer damage penalties
Enemy has fixed infection effect	You may get infected regardless of resistance
Infection stacks get high	Strong debuffs can affect your base and troops

How to Increase Virus Resistance

The main way to increase Virus Resistance is by upgrading the Virus Research Institute.

This is why Immune Protein is so important. Without enough Immune Protein, your Virus Research Institute progress slows down, and you may struggle against stronger infected enemies.

Why Virus Resistance Matters

Virus Resistance affects several parts of Season 1:

• Fighting infected zombies
• Attacking Doom Elites
• Capturing Military Strongholds
• Fighting Corruptors
• Reducing infection risk
• Avoiding heavy damage penalties
• Helping your alliance expand faster

For most players, Virus Resistance should be one of the highest early-season priorities.

New Buildings in Season 1 🏗️

Season 1 introduces new seasonal buildings that are placed outside your normal base perimeter. These buildings are connected to Virus Resistance, Immune Protein production, and hero-type bonuses.

Building	Main Function	Upgrade Resource
Virus Research Institute	Increases Virus Resistance	Immune Protein
Protein Farm	Produces Immune Protein	Mutant Crystal
Military Bases	Boost hero-type stats	Immune Protein and Mutant Crystal

Virus Research Institute

The Virus Research Institute is your most important Season 1 building. It increases Virus Resistance, which helps you fight stronger infected enemies and participate in map objectives.

Upgrade this building steadily throughout the season. If you ignore it, your squad power may look strong on paper, but you will still struggle against enemies with high virus levels.

Protein Farm

The Protein Farm produces Immune Protein. This makes it a key support building because Immune Protein is needed for Virus Research Institute upgrades.

You can unlock multiple Protein Farms as your farm levels increase. One extra Protein Farm may also be tied to the Weekly Pass, depending on the current season setup.

For free-to-play players, upgrading available Protein Farms consistently is very important. Your seasonal progress will depend heavily on your Immune Protein income.

Military Bases

Military Bases become available later in Season 1. These buildings improve hero-type stats such as HP, Attack, and Defense.

There are three Military Base types, connected to the main hero categories. They require both Immune Protein and Mutant Crystals to upgrade.

Military Bases are useful, but they should not completely replace your early Virus Resistance progress. If you are behind on resistance, fix that first.

Map Changes and Alliance Territory 🗺️

Season 1 changes the world map in a big way. Cities fall under enemy control, new infected enemies appear, and alliances must expand from the edge of the map.

At the beginning of the season, alliances start with no owned city. Your alliance needs to capture Military Strongholds first, then use connected territory to reach Cities.

This makes map planning very important.

What Changes on the Map?

Map Feature	Season 1 Change
Cities	Must be recaptured by alliances
Capitol	Becomes part of the Season 1 conflict
Doom Elites	Become infected enemies
Zombies	Many become infectious
Strongholds	Used to expand alliance territory
Warzones	Cross-server conflict becomes more important

The map is no longer just a place to farm zombies. It becomes a territory war map where positioning, timing, and alliance coordination matter.

Military Strongholds and City Capture ⚔️

Military Strongholds and Cities are the core of alliance progression in Season 1.

Your alliance needs Strongholds to expand territory. Cities provide influence, rewards, and strategic control.

Military Strongholds

Military Strongholds are territory points located between Cities. Your alliance must capture them to create a connected path toward city targets.

Rule	Details
Daily capture limit	Up to 2 Military Strongholds per day
First territory	Alliance usually needs a Level 1 Stronghold first
Expansion rule	New targets must connect to owned territory
Protection	Captured Strongholds enter protection for a period
Requirement	Capturing requires enough Virus Resistance
Enemies	Corruptors and Infected Zombies may guard them

Strongholds should not be captured randomly. Your alliance should use them to create a path toward important cities.

City Capture

Cities are bigger objectives than Strongholds. They give alliance influence and can unlock better rewards at the end of the season.

Rule	Details
City declaration limit	Up to 2 Cities per day
Active war limit	One City war at a time
Requirement	Must own adjacent connected territory
Own warzone city limit	Up to 4 Cities
Other warzone city limit	Up to 4 Cities total outside your warzone
Maximum total	Up to 8 Cities total
War declaration duration	1 hour

City capture is one of the biggest reasons to join an organized alliance. Random attacks and poor planning can waste daily declaration chances.

Alliance Influence

Alliance Influence is gained through city control and seasonal map progress. Higher influence can lead to better season rewards.

City level matters because higher-level cities give more influence.

City Level	Influence Value
Level 1	100k
Level 2	200k
Level 3	300k
Level 4	400k
Level 5	500k
Level 6	1M

For alliance leaders, the main goal is not just to capture any city. The goal is to capture cities that help your alliance reach higher influence rankings and better end-season rewards.

Infection Stacks and Healing 🧬

Season 1 adds an infection system. When your troops fight infected enemies or interact with certain virus mechanics, your base can gain Infection Stacks.

Infection Stacks range from 0 to 100. The higher your stack, the worse the debuffs become.

Infection Stack	Debuff Type	General Effect
1+	Hospital Stay	Units can become seriously injured over time
20+	Low Morale	Damage dealt becomes less effective
40+	Fatal Virus	Casualty-related penalty becomes worse
60+	Severe Infection	Troops carry more infection when marching
80+	Virus Plague	Troops may spread infection even when defeated

The exact effect strength can vary based on your infection level. In general, higher stacks are worse.

How You Get Infected

You can gain infection stacks when:

• Attacking zombies with a virus level higher than your Virus Resistance
• Attacking Corruptors
• Attacking Infected Zombies
• Fighting certain World Bosses
• Getting attacked by infected enemy troops

Some enemies can infect you regardless of your Virus Resistance, so always check enemy details before attacking.

How Healing Works

Allies can treat infected players. To get cured, share your coordinates in alliance chat and ask teammates to send treatment.

Helping allies is also useful because curing can reward Gene Fragments. This creates a teamwork loop where active alliances recover faster and earn more seasonal items.

Hero Upgrades and Exclusive Weapons 🚀

Season 1 also adds new hero-related systems. These can include Hero’s Return recruitment, exclusive weapons, and special hero upgrades.

Hero’s Return

Hero’s Return gives players another way to obtain shards for certain UR heroes they may have missed earlier. This is helpful for players who joined later or did not complete earlier hero unlocks.

Hero’s Return tickets may also count toward familiar hero recruitment-related events, depending on the current event setup.

Exclusive Weapons

Exclusive Weapons are special weapons for legendary heroes. They can unlock extra effects, appearances, and skill improvements as they are upgraded.

Exclusive Weapons are usually upgraded using specific weapon shards. In many cases, dedicated shards are required to activate a weapon, while universal shards may only help with upgrades after activation.

Some Season 1 exclusive weapon releases are tied to time-limited passes or specific weeks, so always check the in-game schedule before spending.

Mason UR Upgrade

Season 1 also introduces the ability to upgrade Mason to UR through a seasonal promotion event. This is important because Mason is a familiar hero for many players, and his upgrade can help players strengthen their lineup without starting from zero.

If you use Mason often, pay attention to the Hero Promotion event when it appears.

Season Quests, Passes, and Rewards 🎁

Season 1 has many reward sources. Some are free, while others are linked to paid passes.

Season Quests

Season Quests work similarly to daily missions, but they focus on seasonal objectives. They are important because they can reward Mutant Crystals and other useful items.

Try to complete Season Quests consistently. Missing them slows your seasonal resource income.

Season Passes

Season 1 can include several passes, such as:

Pass Type	Main Benefit
Season Battle Pass	Seasonal resources, hero items, skill points, and other rewards
Weekly Pass	Temporary bonuses, extra Protein Farm, daily items
Exclusive Weapon Passes	Hero-specific weapon shards and related rewards

Paid passes can speed up progress, but they are not mandatory for every player. Free-to-play players should focus on smart resource use, active alliance participation, and daily seasonal tasks.

Season Rewards

Season 1 rewards are usually based on alliance and warzone performance.

Reward Type	Based On
Alliance Rewards	Alliance Influence and city ownership
Warzone Rewards	Warzone ranking and influence performance
Season Merit Medals	Season ranking and reward distribution

Alliance reward tiers can include Gold, Purple, Blue, and Green tiers. Higher tiers require stronger alliance performance, better influence, and important city ownership.

Best Season 1 Priorities for Beginners ✅

If you are new to Season 1, do not try to do everything at once. Focus on the systems that give the biggest long-term value.

Priority 1: Join an Active Alliance

Season 1 is heavily alliance-based. Strongholds, Cities, healing, Gene Fragment exchange, and season rewards all depend on alliance activity.

A strong alliance gives you:

• More capture rewards
• Better territory access
• Faster healing
• Better seasonal coordination
• Higher reward potential
• More protection during war

Priority 2: Upgrade Virus Research Institute

Virus Resistance is the main gatekeeping system of Season 1. If your resistance is too low, your squad will struggle even if your power is high.

Use Immune Protein carefully and keep upgrading your Virus Research Institute.

Priority 3: Upgrade Protein Farms

Protein Farms produce Immune Protein, which supports Virus Research Institute upgrades. This makes Protein Farms a key part of your seasonal economy.

Upgrade them steadily so your Immune Protein income improves over time.

Priority 4: Complete Season Quests

Season Quests are one of the easiest ways to gain seasonal resources. Make them part of your daily routine.

Priority 5: Help Heal Alliance Members

Curing allies helps your alliance stay active and can reward Gene Fragments. Do not ignore infected teammates, especially during heavy event days.

Priority 6: Follow Alliance Capture Plans

Do not attack map objectives randomly. Let alliance leaders plan Stronghold and City routes. Poorly planned captures can waste daily limits and weaken your alliance position.

Best Resource Spending Strategy 💡

Season 1 can feel overwhelming because many systems use new resources. Here is a simple priority order for most players.

Priority	Spend On	Reason
1	Virus Research Institute	Increases Virus Resistance
2	Protein Farms	Improves Immune Protein income
3	Season Quests and goals	Gives more seasonal progress
4	Military Bases	Adds hero-type stat bonuses
5	Exclusive Weapons	Strong but depends on hero investment
6	Optional paid pass bonuses	Useful for spenders, not required for everyone

This order may change depending on your alliance role. Rally leaders and high spenders may push combat systems faster, while free-to-play players should focus on consistent seasonal progress.

Alliance Strategy for Season 1 🏰

Season 1 is not only about personal growth. Alliance planning is one of the biggest factors in success.

What Alliance Leaders Should Plan

Alliance leaders should prepare:

• Stronghold pathing
• City target priority
• War declaration timing
• Rally leaders for infected enemies
• Cross-server diplomacy
• Healing coordination
• Territory defense
• Reward expectations

What Normal Members Should Do

Normal members can help by:

• Joining rallies when asked
• Healing infected allies
• Donating and staying active
• Saving stamina for important events
• Following war instructions
• Not starting random fights
• Sharing enemy movement information

Even if you are not a top spender, you can still contribute a lot by being active and reliable.

Mistakes to Avoid in Season 1 ⚠️

Season 1 punishes careless play. Avoid these mistakes if you want smoother progress.

1. Ignoring Virus Resistance

This is the biggest beginner mistake. High squad power does not protect you from virus mechanics if your resistance is too low.

2. Spending Immune Protein Randomly

Immune Protein is needed for key upgrades. Do not waste it without checking your priority.

3. Not Upgrading Protein Farms

Protein Farms may look simple, but they support your whole seasonal economy. Upgrade them early and often.

4. Attacking Strong Enemies Without Checking Virus Level

Always check the enemy’s virus requirement. If your resistance is too low, you may suffer infection and damage penalties.

5. Staying in an Inactive Alliance

Inactive alliances fall behind fast in Season 1. If your alliance does not capture objectives, heal members, or organize territory, your rewards will suffer.

6. Joining Random Auto-Rallies While Underprepared

Auto-rallies can get your troops infected if they hit dangerous targets. Be careful when your resistance is low.

7. Ignoring Season Quests

Season Quests provide important seasonal resources. Missing them every day adds up quickly.

8. Chasing Exclusive Weapons Without a Plan

Exclusive Weapons are strong, but do not spread resources across too many heroes. Focus on heroes you actually use.

Free-to-Play Tips for Season 1 🎯

Free-to-play players can still do well in Season 1 with smart planning.

Here are the best F2P tips:

• Stay in a strong and active alliance.
• Complete every Season Quest you can.
• Upgrade Virus Research Institute consistently.
• Keep Protein Farms upgraded.
• Save stamina for useful seasonal farming.
• Help heal allies for Gene Fragments.
• Do not fight infected enemies above your resistance unless needed.
• Focus on one main squad instead of spreading upgrades too thin.
• Follow alliance strategy for Strongholds and Cities.

You may not progress as fast as spenders, but consistency matters a lot during an 8-week season.

Should You Buy Season 1 Passes? 💰

Season 1 passes can give useful resources, especially Mutant Crystals, hero shards, Exclusive Weapon shards, stamina, and temporary bonuses.

However, whether they are worth buying depends on your budget and goals.

Player Type	Recommendation
Free-to-play	Skip paid passes and focus on daily activity
Light spender	Consider the best-value pass that supports resource progress
Rally leader	Passes can help push faster seasonal progression
Hero-focused spender	Exclusive Weapon passes may be useful
Casual player	Only buy if you enjoy the season and play daily

Do not buy a pass just because it appears. Check what it gives, how long it lasts, and whether it helps your current goal.

FAQs

What is Season 1 Crimson Plague in Last War Survival?

Season 1 Crimson Plague is the first major seasonal expansion in Last War: Survival. It adds Virus Resistance, infected enemies, new resources, seasonal buildings, alliance territory expansion, City capture, and exclusive hero upgrades.

How long does Last War Survival Season 1 last?

Season 1 starts with a 2-week Pre-Season, followed by 8 weeks of active seasonal gameplay. After that, the season moves into a Celebration or reward phase.

What should I prioritize first in Season 1?

Your first priorities should be joining an active alliance, upgrading the Virus Research Institute, improving Protein Farms, completing Season Quests, and following alliance territory plans.

What is Virus Resistance used for?

Virus Resistance helps your troops fight infected enemies and participate in Season 1 objectives with fewer problems. Low resistance can cause infection, damage reduction, and other penalties.

How do I get Immune Protein in Season 1?

Immune Protein mainly comes from Protein Farms and seasonal rewards. It is used to upgrade the Virus Research Institute and improve your Virus Resistance.

How do I get Mutant Crystals in Season 1?

Mutant Crystals can come from Season Quests, first-time zombie kills, Doom Walker rewards, Genetic Recombination, and season reward systems. They are used for Protein Farms and Military Bases.

Are Military Strongholds important?

Yes. Military Strongholds are required for alliance territory expansion. Your alliance needs connected Strongholds to declare war on Cities.

Can free-to-play players do well in Season 1?

Yes, free-to-play players can still progress well by staying active, upgrading seasonal buildings, completing quests, helping allies, and joining a strong alliance.

Conclusion

Season 1: The Crimson Plague is a major shift in Last War: Survival. It adds new resources, new buildings, infected enemies, Virus Resistance, alliance territory wars, and long-term seasonal rewards.

The best strategy is to focus on the basics first: build Virus Resistance, upgrade Protein Farms, complete Season Quests, and stay active with your alliance. Do not rush random fights or waste resources without a plan.

If you play consistently and follow your alliance strategy, Season 1 can give you a big boost in rewards, hero progress, and overall account strength.

For more beginner-friendly strategy content, you can explore more Last War: Survival guides on Heaven Guardian.