💎 Mutant Crystals – Farming, Spending & Saving
Mutant Crystals are a critical resource in Season 1 of Last War: Survival – The Crimson Plague. While not as scarce as Immune Protein, they gate your ability to unlock and upgrade Protein Farms, Troop Bases, and seasonal utility buildings.
🧬 What Are Mutant Crystals Used For?
| Usage | Details |
|---|---|
| 🔓 Unlocking Farms | Needed to build 2nd, 3rd, and 4th Protein Farms |
| ⬆️ Protein Farm Upgrades | Every farm level requires Crystals to upgrade |
| 💥 Troop Specialty Base | All upgrades require Crystals + Protein |
| ⚠️ Optional Utility | Minor uses in other seasonal events or missions (limited) |
🎯 How to Earn Mutant Crystals
🧬 Genetic Recombination (Top Source)
- Complete building, tech, and troop tasks for milestone rewards
- Weekly event with both free and ranked rewards
- Event pass gives bonus Crystals if purchased
☣️ Plague Crisis (Wave-Based PvE)
- Earn Crystals for every wave cleared
- Top reward source if you can clear high stages
🧟 Doomsday Kill & Infected Hunts
- Points-based event tied to stamina use
- Rewards increase with infected level
🎁 Additional Sources
- Daily/weekly quests
- Login bonuses & milestone events
- Season Battle Pass or store bundles
🔄 Weekly Priorities by Player Type
| Week | F2P Focus | Light Spender Focus | Whale Focus |
|---|---|---|---|
| 1 | Unlock 2nd Farm, Farm Lv5+ | Unlock 2nd/3rd Farms | Unlock all 4 Farms |
| 2 | Upgrade Farms to ~Lv10 | Farm Lv12–15, unlock Troop Base | Farm Lv15–20 |
| 3 | Farm Lv12–15, Troop Base 5+ | Troop Base 10+ | Troop Base 20+ |
| 4 | Hold Crystals for upgrades | Troop Base + Outpost prep | Max Troop Base + backups |
✅ What to Spend Mutant Crystals On
| Priority | Upgrade Target | Why? |
|---|---|---|
| 🔝 Top | Protein Farms | Better Protein production = more scaling |
| ✅ Mid | Troop Specialty Base | Boosts your chosen troop type’s power |
| ⚠️ Conditional | Utility Tasks | Only if tied to events or needed to unlock a building |
🧠 Tip: Avoid overspending early. Troop Base costs ramp up quickly, and Protein Farms remain useful all season.
🧑🏫 Strategy by Player Type
🧑🌾 Free-to-Play (F2P)
Farming Tips:
- Hit milestones in Genetic Recombination every week
- Push Plague Crisis to highest wave you can clear
- Focus stamina on infected mobs during kill events
Spending Priorities:
- Unlock all Protein Farms ASAP
- Level them evenly to ~Lv15 by Week 3–4
- Begin Troop Base only after VRI is near Lv25
Saving Tips:
- Don’t unlock 4th Farm too early if you’re short on Crystals
- Time upgrades with event overlaps to double-dip value
💳 Light Spender
Farming Tips:
- Buy event pass for boosted Genetic Recombination rewards
- Get top 500–1000 in milestone events for bonus Crystals
Spending Priorities:
- Push Farms to Lv15–20 by Week 3
- Invest in Troop Base ~Lv10–15
- Save extra Crystals for Military Base if participating in city war
Saving Tips:
- Avoid unlocking too many troop paths early
- Don’t use Crystals for small buffs or timed upgrades
🐳 Whale
Farming Tips:
- Rank in top 100 for all key events (Genetic Recombination, Crisis)
- Farm highest infected levels daily
- Buy packs containing Crystals or milestone skips
Spending Priorities:
- Max Protein Farms by Week 2–3
- Push Troop Base to Lv30 for main unit
- Consider alt Troop Bases for full meta coverage
Saving Tips:
- Stockpile for Troop Base branches
- Time mass upgrades during construction power events
❌ Common Mistakes to Avoid
- ❌ Overspending Crystals on one farm while ignoring the rest
- ❌ Upgrading Troop Base too early (especially for F2P)
- ❌ Using Crystals outside of event bonuses
- ❌ Wasting them on temporary boosts or timers
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