Last War Season 1 RA Virus Guide: Infection, Resistance, Weather, Cures, and Base Safety

In Season 1, fighting certain enemies can infect your troops. This includes targets such as Zombies, Corruptors, Wanted Bosses, and infected troops. If your Virus Research Institute is not upgraded enough, your infection builds up as Virus Stacks.

Virus Stacks are the core of the system. The more stacks you carry, the worse the consequences become. At low levels, the effect may look manageable. At high levels, your account becomes much less efficient and your base becomes a much bigger liability.

This is why RA Virus is not just a combat problem. It is a progression problem. If you ignore resistance upgrades and keep taking infected fights carelessly, you lose damage, suffer stronger debuffs, and create extra risk for your alliance.

The single most important defensive stat in this system is Virus Resistance. When the enemy's Virus Level is higher than your Virus Resistance, your damage dealt is reduced. In practice, this means you can look powerful on paper and still perform badly against infected targets if your resistance is too low.

The game shows this directly in the attack window. If the required resistance is much higher than what you currently have, your damage penalty can be severe. That is why some players feel like they suddenly cannot kill seasonal enemies efficiently even though their troop power looks fine.

The practical lesson is simple: raw power is not enough in Season 1. You need enough Virus Resistance to actually convert your account strength into real damage.

Every infected fight can add Virus Stacks. One of the key visual signals is the +1 Virus icon after battle, which means one Virus Stack has been added automatically. The number may seem small at first, but repeated PvE farming can build stacks quickly, especially if you are attacking enemies above your resistance comfort level.

This creates a snowball effect. Low resistance makes fights less efficient, less efficient fights often mean more repeated attempts, and more attempts create more Virus Stacks. Those extra stacks then trigger heavier debuffs that make the next fights even worse.

At higher thresholds, RA Virus becomes much more than a damage problem. It can affect wounds, offensive output, infection spread, and eventually create serious base-level consequences if you let stacks climb too far.

RA Virus also ties into one of the biggest Season 1 PvE changes: infected enemies are no longer all functionally the same. Some zombies now have combat types, which means your lineup choice matters much more than it did before.

The guide highlights Tank, Aircraft, and Missile enemy categories. If you keep sending one standard squad into every infected fight, you will lose more troops and waste more stamina than necessary.

This matters even more when your Virus Resistance is already behind. The wrong troop type plus a low-resistance penalty is one of the fastest ways to turn a manageable infected fight into a bad trade.

If your Virus Resistance is below the requirement, the best answer is usually not brute force. The smarter move is to use alliance support and reduce the burden on your own troops.

Ask allies with higher resistance to help kill infected targets. In many cases, it is better to join a rally efficiently than to waste troops trying to force solo progress. This is especially true when the reward matters more than personal credit.

Season 1 often rewards teamwork over ego. If your goal is to unlock stages, collect rewards, and preserve troops, alliance support is often the most efficient solution.

Weather adds another layer to the RA Virus system, and good players pay attention to it before moving, farming, or fighting. Weather changes every 1 to 4 hours, and the forecast can show multiple possible conditions with different probabilities.

Some weather conditions directly increase virus pressure, while others improve farming value or reduce how dangerous infected movement becomes. That means weather is not cosmetic. It changes the safety and efficiency of your decisions.

One of the most important advanced RA Virus mechanics is Permeate. When a base is infected, outgoing teams carry 25% of that base's Virus Stacks with them.

This turns infection into a movement problem, not just a stationary base problem. Even if you think your troops are only leaving the base for a routine task, they may already be taking virus pressure with them.

Once your base is infected, every outgoing march needs more attention. If you keep moving troops carelessly, you can spread the problem instead of containing it.

The guide also explains what happens when a base is attacked while infected. This is one of the easiest ways for players to create expensive problems without realizing it.

The result depends on the target's defensive state. If there is no defense, infection is transmitted. If there is defense but no troops, there is no transmission. If there is both defense and troops, the carried Virus Stacks are transmitted.

That means infected players should think carefully before entering base fights. Under the wrong conditions, normal combat can spread RA Virus instead of solving anything.

There are two main cure methods shown in the guide. Manual Cure lets an ally send an aircraft to remove 1 Virus Stack. Auto Cure slowly reduces Virus Stacks if no new infections occur.

The problem is that Auto Cure is very slow. It is helpful for light cleanup, but it is not a reliable answer when your stack count is rising quickly or when you are already carrying serious debuffs.

That is why active communication matters. If your stacks are building fast, ask for cures through alliance chat before the problem becomes expensive.

RA Virus rewards disciplined play. The strongest Season 1 players are not just the ones with the biggest accounts. They are the ones who manage resistance upgrades well, fight infected targets efficiently, use alliance support intelligently, and avoid spreading infection through careless movement.

Most major RA Virus mistakes are very predictable. Players treat Virus Resistance as optional, ignore the weather, let Virus Stacks rise too high before asking for cures, or keep attacking infected content blindly because their normal squad power looks strong.

If you want one simple rule to remember, use this one: never attack infected content blindly. Check your Virus Resistance, check the weather, check your stack situation, and only then commit troops.