Feeling stuck with low City Power in Last Asylum: Plague? You’re not alone. A lot of players rush random upgrades, waste speedups, and then hit a massive wall later. Big power doesn’t come from upgrading everything equally. It comes from smart progression. If you want faster Sanctuary upgrades, stronger heroes, better troops, and easier event rewards, you need an economy first strategy. In this Last Asylum: Plague building guide, we’ll break down the fastest and smartest ways to increase City Power in Last Asylum: Plagu without wasting resources.
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Upgrade City Power in Last Asylum: Plague
What Is City Power in Last Asylum: Plague?
Let’s learn what is the city power from this Last Asylum: Plague building guide first. City Power, also called Might or Combat Power in Last Asylum: Plague, is basically the total strength of your entire account. It shows how powerful your city, heroes, troops, research, and defenses are combined. The higher your City Power, the stronger your progression becomes across PvE, alliance events, Rat Swarms, and PvP battles. But having high power alone doesn’t mean you’re strong. Smart upgrades, balanced growth, and efficient resource management matter more than boosting numbers.
City Power Mainly Comes From:
Sanctuary level upgrades
Building upgrades
Research and technology progress
Hero levels, stars, and skills
Troop training and higher troop tiers
Survivor management and assignments
Defensive structures like towers and walls
Event progression and special unlocks
Sanctuary Is the Main Source of City Power
This is the heart of your entire city and the biggest source of City Power progression in the game. Players who upgrade their Sanctuary smartly progress much faster than players who randomly level buildings without a plan. Every sanctuary upgrade:
Directly increases City Power
Unlocks new systems and buildings
Raises hero level caps
Improves base hero stats (HP, ATK, DEF)
Unlocks stronger troop progression
Increases building level limits
Sanctuary
Best Building Upgrade Priority
This is the most important part section of this Last Asylum Plague Sanctuary upgrade guide. The following order helps you upgrade City Power in Last Asylum Plague.
1. Resource Buildings (Highest Priority)
Before pushing Sanctuary upgrades, make sure your economy can actually support the next stage of progression. Keeping your production buildings upgraded gives you steady growth, smoother upgrades, faster healing, and constant troop training without painful bottlenecks. Prioritize these buildings first because they are the most important:
| Building | What You Should Do |
| Farm | Keep this upgraded to maintain enough Grain for troop training, healing, and city growth. |
| Lumberyard | Upgrade this often because Timber is required for almost every major construction upgrade. |
| Herb Garden | Don’t ignore Herbs early; keep production high for medicine, treatment, and later-game crafting systems. |
| Warehouse/Storage | Increase storage capacity regularly so resources don’t cap while you’re offline. |
| Housing/Survivor Buildings | Upgrade these to support more survivors and improve overall production efficiency. |
Farm
If you start running low on resources during big Sanctuary upgrades or troop training, your progression can slow down fast. To avoid long waiting times, you can use Lootbar Last Asylum: Plague Top Up to get extra upgrade materials quickly.
2. Upgrade Storage Early
Most players ignore warehouses early, but that becomes a huge mistake later. If your storage fills up while you’re offline, you lose hours of free resource production every single day. To avoid wasting progress, try to maintain at least 12+ hours of storage capacity and make sure you have enough space for overnight farming before logging out.
Upgrade these to long-term growth:
Warehouse
Granary
Herb Storage
Resource depots
3. Push Sanctuary When Ready
Once your economy and storage are stable:
Push Sanctuary
Unlock new systems
Raise building caps
Increase overall Might
This is where you should use major speedups. Best time to use speedups is:
Big Sanctuary unlocks
Event windows
Alliance Construction events
Important milestone upgrades
Avoid wasting speedups on low-value buildings.
4. Research Is One of the Biggest Power Multipliers
Research gives permanent account-wide bonuses. Smart research compounds your growth faster every single day.
Best Early Research Priority:
| Research Tree | Priority |
| Development | Highest |
| Construction Speed | Very High |
| Research Speed | Very High |
| Economy | High |
| Training Speed | High |
| Combat Trees | Mid Game |
| Advanced Military | Late Game |
Training Speed
5. Upgrade Heroes the Smart Way
Heroes are the biggest power suppliers in Last Asylum: Plague, but this is also where many players waste valuable materials. A properly upgraded team helps you clear Rat Swarms, PvE stages, alliance events, ruins, and farming content much faster.
Upgrade Heroes
Focus on one main hero squad before upgrading secondary heroes.
Build a balanced team with a Tank, DPS hero, and Support hero.
Prioritize your strongest UR or SSR heroes for long-term progression.
Save Antitoxin, hero shards, and skill materials for key heroes only.
Upgrade hero skills regularly since they increase combat effectiveness heavily.
Use heroes that perform well in Rat Swarm and PvE progression content.
Avoid spreading resources across too many low-tier heroes early game.
Keep your main squad close to your Sanctuary progression level.
6. Keep Troop Training Active
Troops contribute heavily to your overall City Power in Last Asylum: Plague, so you should never let your training Grounds should always be producing new units. Constant troop training helps increase your performance in PvE battles, alliance wars, Rat Swarms, and events.
As you progress, focus more on unlocking higher troop tiers instead of producing huge numbers of weak units. Upgrading your Training Grounds, researching troop-related technologies, and maintaining enough food production will help you train troops more efficiently.
Training Grounds
7. Survivors Matter More Than You Think
A lot of players focus only on Sanctuary upgrades, heroes, and troops while completely ignoring survivors. That’s a huge mistake because survivors are one of the biggest drivers of your economy. If survivors stay idle, your entire account grows slower without you even noticing it.
Survivors
Always assign survivors to the areas that improve your daily progression the most. A well-managed survivor system creates steady resource income, smoother upgrades, and faster long-term City Power growth.
| Survivor Task | Why It’s Important |
| Resource Production | Boosts Grain, Timber, and Herb generation for faster upgrades. |
| Gathering | Helps collect more resources from the world map efficiently. |
| Outposts | Improves resource generation and expansion progression. |
| Economy Bonuses | Increases overall production speed and city efficiency. |
| Housing Upgrades | Supports more survivors and improves long-term growth potential. |
8. Rat Swarm Defense Tips
Rat Swarm becomes one of the biggest progression walls later in Last Asylum: Plague. If your defenses are weak, clearing waves becomes much harder, which slows your overall growth and reward farming. Many players fail because they randomly place towers everywhere instead of building proper defensive setups.
The best strategy is creating strong defense zones instead of spreading your power across the entire map. A focused defense setup clears waves much more efficiently and helps you survive harder stages later.
Better Defense Strategy:
| Defense Setup | Why It Works |
| Choke Points | Forces enemies into smaller areas for easier damage stacking. |
| Funnel Paths | Controls enemy movement and improves tower efficiency. |
| Overlapping Kill Zones | Multiple towers attacking the same area deal massive damage quickly. |
| Focused Tower Upgrades | One strong defense area is better than several weak ones. |
9. Best Daily Routine for Fast City Power
Following a simple daily routine keeps your economy active, your research progressing, and your account constantly improving without wasting time or resources.
Daily Task
| Daily Task | Why You Should Do It |
| Collect Resources Constantly | Prevents production waste and keeps upgrades moving. |
| Keep Research Running | Gives permanent bonuses for faster progression. |
| Keep Troop Training Active | Increases Combat Power and troop strength daily. |
| Upgrade Economy Buildings | Supports long-term resource production. |
| Prepare Sanctuary Requirements | Helps avoid upgrade bottlenecks later. |
| Complete Rat Swarms | Gives important rewards and progression materials. |
| Join Alliance Events | Earns extra speedups, resources, and rewards. |
| Use Survivor Assignments Properly | Maximizes production and gathering efficiency. |
| Save Speedups for Big Upgrades | Gives better value during important progression pushes. |
Best F2P Strategy for Fast Power Growth
As a F2P player, you won’t have unlimited speedups, premium materials, or instant upgrades. So you need to use your resources carefully. If you stay consistent with your daily progress and plan your upgrades properly, you can still grow your City Power very quickly without spending money.
Here’s a simple mindset and daily routine you should follow:
Log in multiple times a day to collect resources
Restart all short upgrades whenever they finish
Assign survivors as soon as you unlock new ones
Keep research running 24/7 without downtime
Save speedups for Sanctuary and major upgrades
Focus upgrades on economy and Sanctuary first
Train troops continuously to boost City Power
Join an active alliance for faster progression help
Track your resources so you never run into shortages
Use Rat Swarm battles to practice better defense setups
Pure F2P play is completely sustainable and very rewarding if you stay consistent, but as you progress, you may notice that some upgrades, hero pulls, or resource shortages start taking longer to manage. At that stage, you might look for a small boost to speed things up without going into heavy spending. If you decide to progress faster without breaking your budget, many players use Lootbar for affordable top-ups on Diamonds, Banknotes, and value packs.
Lootbar
Conclusion
Building huge City Power in Last Asylum: Plague isn’t about upgrading everything randomly. It’s about building smart momentum. A strong economy funds Sanctuary upgrades, better heroes clear harder content, and constant research keeps your account growing every single day. Focus on production first, push Sanctuary carefully, invest in one strong squad, and use events strategically. If you stay consistent, your City Power will start snowballing much faster than most players on the server.
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