The Emergency Center in Last War: Survival is a troop-loss safety net that unlocks at Headquarters level 22. When a World Map battle produces more casualties than your Hospital can hold, the Emergency Center can convert a percentage of troops that would otherwise die into fainted units that can be rescued.
Upgrading the Emergency Center improves three important stats: the Fainted Unit Ratio, the maximum fainted-unit capacity, and the rescue cooldown. The ratio starts at 21% at level 1 and reaches 40% at level 20, while capacity continues increasing through the Age of Oil levels up to level 35.
★Quick Take
The Emergency Center does not replace your Hospital. It only helps save some troops that would otherwise be lost after Hospital capacity is exceeded. Keep Hospital capacity high first, then use the Emergency Center as a second layer of protection for high-casualty World Map PvP.
How the Last War Emergency Center Works
The Emergency Center is sometimes called the ICU or Rescue Center by players. Its purpose is different from normal Hospital healing.
When casualties are generated in an eligible World Map battle, injured troops first use the Hospital system. If the Hospital is already full, troops that would normally die can instead become fainted units according to your Emergency Center’s Fainted Unit Ratio. Those units are then limited by the building’s Fainted Unit Capacity.
The three core stats are:
- Fainted Unit Ratio: The percentage of eligible troops that would otherwise die but can be converted into fainted units. It increases from 21% at level 1 to 40% at level 20.
- Fainted Unit Capacity: The maximum number of fainted units that the Emergency Center can hold at one time. It starts at 450 and reaches 2,000 at level 30 before increasing further through levels 31–35.
- Rescue Cooldown: The waiting period between rescues. Upgrading the building gradually reduces this cooldown.
The building unlocks at HQ22. If you are still progressing toward that point, the Last War Headquarters upgrade guide covers the building and resource requirements for each HQ milestone.
Which Battles Produce Fainted Units?
One of the most important limitations is that fainted units are tied to battles where real troop deaths can occur. Current Last War guidance specifically identifies World Map battles as eligible.
Modes such as Desert Battlefield and Winter Battlefield do not produce fainted units because troops are not permanently killed in those battles. This means Emergency Center capacity is primarily a concern before real-loss PvP rather than every combat mode in the game.
!Important
Do not judge your Emergency Center needs from modes with protected troops. The building matters most when fighting on the World Map and during other combat where actual troop deaths can occur after your Hospital fills.
Emergency Center Upgrade Costs and Stats
The Emergency Center becomes steadily more useful during the first 20 levels because both its rescue ratio and capacity improve. After level 20, the normal Fainted Unit Ratio has reached 40%, so later upgrades mainly provide additional capacity and shorter cooldowns.
The table below highlights the most useful progression milestones. Resource values are reference base costs; always check the number shown in your own game before opening resource chests because applicable account bonuses and game tuning can affect displayed requirements.
| Level | Iron | Food | Coin | Fainted Unit Ratio | Capacity | Rescue Cooldown |
|---|---|---|---|---|---|---|
| 1 | 10 | 10 | — | 21% | 450 | 2d 12h |
| 5 | 14,000 | 14,000 | — | 25% | 650 | 2d 10h |
| 10 | 370,000 | 370,000 | 60,000 | 30% | 900 | 2d 8h |
| 15 | 3,400,000 | 3,400,000 | 550,000 | 35% | 1,150 | 2d 6h |
| 20 | 30,000,000 | 30,000,000 | 4,800,000 | 40% | 1,400 | 2d 4h |
| 25 | 140,000,000 | 140,000,000 | 23,000,000 | 40% | 1,700 | 2d 2h |
| 30 | 720,000,000 | 720,000,000 | 120,000,000 | 40% | 2,000 | 2d |
A key breakpoint is Emergency Center level 20. At that point, the building reaches its standard 40% Fainted Unit Ratio. Levels 21–30 do not raise that percentage further, but capacity increases from 1,400 at level 20 to 2,000 at level 30 while the cooldown continues to improve.
Emergency Center Levels 31–35 and Age of Oil
After Season 2, the warzone progresses into the Age of Oil. This system eventually raises the Headquarters level cap to 35 and allows normal buildings, including the Emergency Center, to continue beyond level 30.
Access to the Age of Oil technology tree currently requires a level 30 Tech Center and at least 40% completion of Special Forces research. The older 80% Special Forces requirement was reduced. Progressing through the tree and completing the relevant HQ Expansion research unlocks the higher building levels.
You can read more about the transition from Season 2 in the Last War Season 2: Polar Storm guide and review Tech Center progression in the Last War Tech Center guide.
Emergency Center Level 31–35 Costs
| Level | Iron | Food | Coin | Oil | Fainted Unit Ratio | Capacity | Rescue Cooldown |
|---|---|---|---|---|---|---|---|
| 31 | 790,000,000 | 790,000,000 | 130,000,000 | 360,000 | 40% | 2,020 | 2d |
| 32 | 870,000,000 | 870,000,000 | 140,000,000 | 576,000 | 40% | 2,040 | 2d |
| 33 | 960,000,000 | 960,000,000 | 150,000,000 | 979,200 | 40% | 2,060 | 2d |
| 34 | 1,000,000,000 | 1,000,000,000 | 160,000,000 | 1,762,560 | 40% | 2,080 | 2d |
| 35 | 1,100,000,000 | 1,100,000,000 | 170,000,000 | 3,525,120 | 40% | 2,100 | About 1d 22h |
Levels 31–35 are expensive for relatively small capacity increases: each upgrade adds 20 additional base fainted-unit slots while Oil costs increase rapidly. For F2P players, this makes the Emergency Center a lower-priority Oil investment unless World Map troop losses are a regular problem.
Rescue Time vs. Rescue Cooldown
Rescue time and rescue cooldown are separate mechanics, and confusing them can lead to poor planning.
- Rescue time: Once you start rescuing fainted units, the process takes time. Normal speedups and Diamonds cannot be used to shorten this rescue process.
- Alliance help: Alliance assistance can reduce the rescue time, making an active alliance useful after a heavy battle.
- Rescue cooldown: After a rescue, the Emergency Center enters a cooldown before the rescue function can be used again. Building upgrades gradually lower this cooldown.
Because another large World Map battle can happen while your rescue function is unavailable, checking the cooldown before committing to repeated high-casualty fights is more important than simply looking at the building’s capacity.
Hospital vs. Emergency Center: Which Should You Upgrade First?
For most accounts, the Hospital should have priority. Hospital capacity prevents troops from reaching the permanent-loss stage in the first place, while the Emergency Center only saves a portion of troops after that capacity has already been exceeded.
A simple priority order is:
- Maintain enough Hospital capacity for the casualty levels you normally experience.
- Upgrade the Emergency Center when Hospital overflow becomes common.
- Increase the Emergency Center more aggressively if you regularly participate in heavy World Map PvP.
- At HQ31+, compare the benefit of another Emergency Center level against other buildings competing for your limited Oil.
If your Hospital rarely fills, spending a large amount of resources on the Emergency Center may provide little immediate benefit. If you regularly overflow the Hospital during Warzone combat or other real-loss battles, additional Emergency Center capacity becomes much more valuable.
How Much Does Emergency Center Level Matter?
The biggest improvement occurs between levels 1 and 20. A level 1 Emergency Center has a 21% Fainted Unit Ratio and 450 capacity. At level 20, the base ratio reaches 40% and capacity reaches 1,400.
After level 20, the ratio stops increasing through normal building upgrades. The main benefit becomes additional capacity:
- Level 20: 1,400 capacity
- Level 25: 1,700 capacity
- Level 30: 2,000 capacity
- Level 35: 2,100 capacity
This difference matters when large casualty waves arrive at once. A high rescue percentage cannot save units beyond the building’s available capacity, so both stats need to be considered together.
Season 3 Skills That Can Improve the Emergency Center
Seasonal profession systems can provide additional Emergency Center bonuses beyond the building’s normal stats. During Season 3, available profession skills include bonuses such as:
- First Aid Expert: Can increase the proportion of defeated units entering the Emergency Center by up to 5% when fully developed.
- Emergency Capacity: Can add up to 250 to the Emergency Center’s capacity when fully developed.
These are seasonal profession bonuses rather than permanent building-level stats, so evaluate them based on your profession path and current season. They can be particularly valuable for players expecting frequent World Map PvP.
✓Recommendation
Before a major World Map battle, check four things together: Hospital capacity, Emergency Center capacity, whether the rescue function is available, and how many troops you are prepared to lose permanently if both recovery systems overflow.
Tips to Reduce Permanent Troop Losses
Keep Hospital Capacity Ahead of Your Normal Casualties
The Emergency Center should be your backup, not your main recovery plan. A larger Hospital prevents more troops from entering the overflow calculation at all.
Check the Emergency Center Before World Map PvP
Do not enter a long sequence of attacks without checking current fainted units and rescue availability. If the building is already close to capacity, another poor fight can produce permanent losses that could have been avoided.
Do Not Waste Speedups on the Rescue Process
Normal speedups and Diamonds cannot shorten Emergency Center rescue time. Use alliance assistance where available rather than planning around a large speedup stockpile.
Keep Your Troop Quality Competitive
The best way to reduce recovery pressure is to avoid unnecessary casualties. Hero strength, formations, troop tiers, and combat statistics all influence how costly a battle becomes. The Last War troop stats guide explains the main attributes involved.
Be Careful With Oil After HQ30
Emergency Center levels 31–35 improve capacity only gradually while consuming increasing amounts of Oil. F2P players should normally prioritize upgrades that directly block Headquarters progression or materially improve their main squad before committing scarce Oil to marginal recovery capacity.
Use Relevant VIP and Development Bonuses
Construction and progression bonuses can make high-level building upgrades easier to manage. Review the Last War VIP levels and perks guide before committing large amounts of resources to late-game construction.
Is Upgrading the Emergency Center Worth It?
Yes, but its priority depends heavily on how you play. PvP-heavy accounts benefit more because they are more likely to overflow Hospital capacity during real-loss battles. Players who spend most of their time on PvE or protected battlefield modes may see less immediate value.
For F2P players, reaching level 20 is an important mechanical milestone because that is where the standard Fainted Unit Ratio reaches 40%. After that point, each upgrade should be weighed mainly against the value of additional capacity and a slightly shorter cooldown.
Players who prefer starting from an already-developed base rather than building every recovery system from the early game can also browse Last War accounts for sale as an optional progression path. For players developing their own base, keeping Hospital and Emergency Center investment proportional to actual PvP losses is usually the better resource-management approach.
Common Emergency Center Mistakes
- Assuming the Emergency Center protects every casualty: It only converts a percentage of eligible would-be losses, and capacity still applies.
- Ignoring Hospital upgrades: A weak Hospital causes more troops to overflow into the permanent-loss stage.
- Using protected battle modes to judge capacity needs: Modes without real troop deaths do not provide a useful test of your Emergency Center.
- Confusing rescue time with cooldown: They are separate restrictions.
- Expecting speedups to finish rescues: Standard speedups and Diamonds cannot reduce Emergency Center rescue time.
- Assuming the ratio keeps rising after level 20: Normal building upgrades cap the base Fainted Unit Ratio at 40% from level 20 onward.
- Overspending Oil after HQ30: Levels 31–35 can be expensive relative to their additional capacity, especially for F2P accounts.
FAQs
When does the Emergency Center unlock in Last War?
The Emergency Center unlocks at Headquarters level 22. It can then rescue some troops that would otherwise be lost after your Hospital exceeds its capacity.
What is the maximum Fainted Unit Ratio?
Normal Emergency Center upgrades raise the Fainted Unit Ratio to 40% at level 20. Levels 21–35 retain the 40% base ratio while continuing to increase capacity and improve the rescue cooldown.
What happens when the Emergency Center is full?
The Emergency Center cannot accept fainted units beyond its available capacity. Troops that cannot be protected by the Hospital or Emergency Center can become permanent losses in battles where real troop deaths apply.
Does the Emergency Center work in Desert Battlefield or Winter Battlefield?
No fainted units are generated in those protected battlefield modes because they do not cause real troop deaths. The Emergency Center is mainly relevant to eligible World Map battles.
Can speedups reduce Emergency Center rescue time?
No. Standard speedups and Diamonds cannot shorten the rescue process. Alliance help can reduce rescue time, but the building also has a separate cooldown between rescues.
Should I upgrade the Hospital or Emergency Center first?
Usually the Hospital. It is your primary casualty-storage system, while the Emergency Center protects only some overflow troops. Increase the Emergency Center’s priority if your Hospital frequently fills during real-loss PvP.
Conclusion
The Last War Emergency Center becomes most valuable when your Hospital can no longer absorb all casualties from World Map combat. Getting it to level 20 raises the normal Fainted Unit Ratio to 40%, while later upgrades focus on capacity and cooldown improvements. Prioritize Hospital capacity first, monitor the rescue cooldown before major fights, and be selective about spending Oil on levels 31–35.
For more building, combat, event, and progression strategies, browse our Last War Survival guides.
