Virus Resistance Calculator

Virus Resistance is a Season 1, Crimson Plague combat stat in Last War: Survival. Every infected target has a resistance requirement. When your squad is below that requirement, the virus mechanic can reduce the damage you deal, so the right target is not always the highest level your squad power can reach.

This Last War Virus Resistance Calculator compares your current VR with the listed requirements for Stronghold Bosses, Doom Elites, and Zombies. It gives you a quick readiness benchmark before you spend stamina, send troops, or ask alliance members to join a rally.

In practical terms, Virus Resistance answers a different question from squad power. Power tells you how much strength your squad brings to a fight; VR tells you whether the virus mechanic will reduce that strength against the selected enemy. Checking both lets you avoid the frustrating situation where a squad looks powerful enough on paper but performs poorly because it is below the target's resistance requirement.

Start by entering the Virus Resistance shown on your account. You can type a value, move the slider, or choose a quick value. The Quick Check cards then show the highest Boss, Doom Elite, and Zombie level where the calculator models no VR damage penalty.

For one specific infected target, open Zombie Solo and enter the Zombie level, enemy type, your squad type, squad power, and VR. The result combines the modeled VR penalty with the aircraft, tank, and missile counter cycle, so it is more useful than looking at resistance alone. Use it when deciding which squad should take a solo zombie or whether a troop-type disadvantage makes the attempt too risky.

For alliance content, use Rally Planner to enter up to five power slots and the resistance of each member. The planner applies the leader's VR to the rally output, compares troop types against a Stronghold Boss, and flags when another submitted member has higher VR and may be the better rally lead. Doom Walker is a separate check: enter the Walker level and compare each member's suggested power. Doom Walkers use power thresholds in this tool, not Virus Resistance. Finally, open Reference Tables when you need every level requirement or want to distinguish verified values from estimated planning values.

You can still use the calculator for a target above the full-damage level. The fight-specific modes show how much of a VR penalty the model applies, which is more useful than a simple yes-or-no answer. Compare that penalty with your effective power and troop matchup, then make a conscious decision about whether the likely losses are acceptable for the reward.

The reference tables label rows as Verified or Estimated. Use estimated values as directional guidance and always treat in-game combat information as the final authority when requirements or results change.