Season 1 Overview: The Crimson Plague
The first season: a virus spreads across the map, alliances fight for Strongholds and Cities, and the first Exclusive Weapons arrive.
The Crimson Plague is the first season. A virus spreads across a much larger world map. Alliances start at the edge with no cities and push inward through Strongholds and Cities toward the old Capitol, now the City of Apocalypse.
At a glance
| Topic | Details |
|---|---|
| Pre-season | 2 weeks (previews, daily goals, Capitol Conquest) |
| Season | 8 weeks, then settlement |
| Core mechanic | Virus infection and Virus Resistance |
| Season resources | Immune Protein, Mutant Crystal, Gene Fragments |
| Ranked on | Alliance Influence from cities |
Week by week
| Week | Highlights |
|---|---|
| 1 | Virus Research Institute and Protein Farms. Purge Action. Strongholds open (day 3). City Clash begins (day 4). Kimberly's Exclusive Weapon |
| 2 | Mason SSR→UR opens. Crimson Legion NPC attacks on cities (Tuesday and Friday) |
| 3 | Tank, Aircraft and Missile Military Bases. Captures in other warzones begin. Saturday war days. DVA's weapon |
| 4 | City war limited to declaration days. Warzone Duel preview. City of Apocalypse contest |
| 5 | Cross-warzone Capitol competition |
| 6 | Tesla's weapon |
| 7 | The Final Battle: last push for Influence |
| 8 | Settlement. Captures freeze, resources convert |
City levels unlock gradually: level 1 on day 4, up to level 6 by day 21, and the City of Apocalypse around day 28.
Seasonal buildings
- Virus Research Institute (up to level 30, costs Immune Protein) raises your Virus Resistance. Your most important building this season.
- Protein Farms (up to 4, plus a 5th with the Weekly Pass) produce Immune Protein. Farm 2 unlocks when Farm 1 reaches level 5, then each later farm at level 10 of the one before.
- Military Bases (Tank, Aircraft, Missile): each level adds +1% HP, Attack and Defense for that troop type. Pick the one matching your main squad.
Heroes
- Exclusive Weapons: Kimberly (week 1), DVA (week 3), Tesla (week 6). Each needs the hero at 5★ and 50 named shards.
- Mason can be promoted SSR → UR from week 2. He drops to 3★ UR, and rebuilding takes about 1,600 shards. Mason is mainly a PvE hero, so don't bench Marshall for him too early.
End of season
Immune Protein, Mutant Crystal and Gene Fragments convert to Profession EXP, and seasonal buildings disappear. Weapons, professions and recruitment tickets stay. The Celebration off-season follows, adding the Emergency Center building and Alliance Duel research permanently.
Next: Virus, Strongholds & Cities.
Sources
Compiled from community guides (last checked October 2026). Season details changed between servers and patches, so trust the in-game Season screen if something differs.