The Whiteout Survival Fire Crystal Infirmary is the advanced version of the regular Infirmary after Level 30. Its primary purpose remains the same: storing severely injured troops so they can be healed instead of becoming permanent losses.
However, Fire Crystal progression introduces additional construction stages, higher resource costs, Furnace requirements, and eventually Refined Fire Crystals. As a result, upgrading the Infirmary becomes a long-term investment rather than a simple support-building upgrade.
This guide explains the complete Infirmary FC1-FC10 upgrade path, including resource requirements, base capacity, construction time, Refined Fire Crystal costs, research priorities, healing strategies, and common mistakes.
Upgrading the Infirmary from Level 30 to FC10 requires approximately 1.28 billion Meat, 1.28 billion Wood, 257.5 million Coal, 63.65 million Iron, 2,314 Fire Crystals, and 174 Refined Fire Crystals. Its base capacity increases from 66,500 at Level 30 to 121,500 at FC10.
What Is the Fire Crystal Infirmary?
The Fire Crystal Infirmary is a late-game support building that becomes available after your regular Infirmary reaches Level 30 and Fire Crystal content is active in your state.
It does not directly increase troop Attack, Defense, Health, or Lethality. Instead, it protects your existing army by increasing the number of severely injured troops that can be stored and healed.
| Benefit | Why it matters |
|---|---|
| Higher Infirmary capacity | Allows more severely injured troops to be stored after battle |
| Lower overflow risk | Reduces the number of wounded troops exceeding normal capacity |
| Higher building power | Adds permanent power with every completed construction stage |
| Better PvP preparation | Provides more recovery space during repeated alliance and state battles |
The building is especially valuable for players who participate in State of Power, Sunfire Castle, fortress battles, city defense, and other activities that can produce large numbers of wounded troops.
How Fire Crystal Infirmary Levels Work
The Infirmary does not upgrade directly from Level 30 to FC1 or from one full FC level to the next. Each major level contains four intermediate stages followed by one final stage.
| Upgrade range | Required stages |
|---|---|
| Level 30 to FC1 | 30-1 → 30-2 → 30-3 → 30-4 → FC1 |
| FC1 to FC2 | FC1-1 → FC1-2 → FC1-3 → FC1-4 → FC2 |
| FC5 to FC6 | FC5-1 → FC5-2 → FC5-3 → FC5-4 → FC6 |
| FC9 to FC10 | FC9-1 → FC9-2 → FC9-3 → FC9-4 → FC10 |
Therefore, the material cost displayed for one intermediate stage is not the total required for the next full FC level. You normally need to pay for five separate construction stages.
For example, each stage between Level 30 and FC1 costs 26 Fire Crystals. The complete Level 30-to-FC1 progression costs 130 Fire Crystals.
Fire Crystal Infirmary Unlock Requirements
Before beginning Fire Crystal Infirmary upgrades, you must meet three general conditions:
- Your regular Infirmary must reach Level 30.
- Fire Crystal content must be available in your state.
- Your Furnace must reach the Fire Crystal level required by the target Infirmary stage.
The Infirmary requires a matching Furnace milestone for each upgrade range.
| Infirmary goal | Required Furnace | Number of stages |
|---|---|---|
| FC1 | Furnace FC1 | 5 |
| FC2 | Furnace FC2 | 5 |
| FC3 | Furnace FC3 | 5 |
| FC4 | Furnace FC4 | 5 |
| FC5 | Furnace FC5 | 5 |
| FC6 | Furnace FC6 | 5 |
| FC7 | Furnace FC7 | 5 |
| FC8 | Furnace FC8 | 5 |
| FC9 | Furnace FC9 | 5 |
| FC10 | Furnace FC10 | 5 |
Planning tip: Check the complete Fire Crystal Furnace requirements before reserving materials for the Infirmary. An Infirmary upgrade cannot begin when the Furnace requirement is still incomplete.
Whiteout Survival Infirmary FC1-FC10 Cost Chart
The following table shows the combined cost of all five construction stages between each full Fire Crystal milestone.
These figures apply only to the Infirmary. Furnace and other city-building costs are separate.
| Upgrade range | Meat | Wood | Coal | Iron | Fire Crystals | Refined FC | Base time | Final capacity |
|---|---|---|---|---|---|---|---|---|
| Level 30 → FC1 | 80M | 80M | 16.5M | 4.2M | 130 | 0 | 4d 21h 35m | 72,000 |
| FC1 → FC2 | 90M | 90M | 18M | 4.5M | 155 | 0 | 6d 7h 10m | 77,500 |
| FC2 → FC3 | 95M | 95M | 19.5M | 4.95M | 235 | 0 | 7d 16h 45m | 83,000 |
| FC3 → FC4 | 100M | 100M | 20.5M | 5M | 280 | 0 | 8d 9h 35m | 88,500 |
| FC4 → FC5 | 105M | 105M | 21M | 5M | 335 | 0 | 9d 19h 10m | 94,000 |
| FC5 → FC6 | 120M | 120M | 24M | 6M | 180 | 12 | 10d 12h | 99,500 |
| FC6 → FC7 | 135M | 135M | 27M | 6.5M | 216 | 18 | 12d 14h 20m | 105,000 |
| FC7 → FC8 | 165M | 165M | 33M | 8M | 216 | 24 | 14 days | 110,500 |
| FC8 → FC9 | 180M | 180M | 36M | 9M | 252 | 36 | 9d 2h 20m | 116,000 |
| FC9 → FC10 | 210M | 210M | 42M | 10.5M | 315 | 84 | 14 days | 121,500 |
All construction times are base values. Your actual timer can be lower because of construction research, Chief bonuses, pets, State buffs, alliance help, and other active effects.
Total Infirmary Cost From Level 30 to FC10
| Resource | Total required |
|---|---|
| Meat | 1.28 billion |
| Wood | 1.28 billion |
| Coal | 257.5 million |
| Iron | 63.65 million |
| Fire Crystals | 2,314 |
| Refined Fire Crystals | 174 |
| Base construction time | Approximately 97 days, 6 hours, and 55 minutes |
| Capacity increase | 66,500 at Level 30 to 121,500 at FC10 |
These totals do not include the cost of upgrading your Furnace. Therefore, your complete account progression cost will be considerably higher.
Fire Crystal Infirmary Capacity Guide
Capacity is the most important benefit provided by the Fire Crystal Infirmary. It determines how many severely injured troops can be stored in the building at one time.
| Infirmary level | Base capacity | Increase from previous full level |
|---|---|---|
| Level 30 | 66,500 | Starting point |
| FC1 | 72,000 | +5,500 |
| FC2 | 77,500 | +5,500 |
| FC3 | 83,000 | +5,500 |
| FC4 | 88,500 | +5,500 |
| FC5 | 94,000 | +5,500 |
| FC6 | 99,500 | +5,500 |
| FC7 | 105,000 | +5,500 |
| FC8 | 110,500 | +5,500 |
| FC9 | 116,000 | +5,500 |
| FC10 | 121,500 | +5,500 |
These are base values. Your displayed capacity can be considerably higher because of permanent research and temporary appointments.
How to Increase Infirmary Capacity
Upgrading the building is only one way to increase wounded troop capacity. A well-developed account combines several systems.
Upgrade the Infirmary
Every full Fire Crystal level adds 5,500 base capacity. Keeping the Infirmary reasonably close to your Furnace provides a reliable permanent increase.
Research Ward Expansion
Ward Expansion is located in the Growth section of the Research Center. It permanently increases Infirmary capacity and is particularly useful for active PvP players.
Because the research bonus applies continuously, it can provide strong value even when you are not ready to spend Fire Crystals on another building stage.
Use Minister of Health
The Minister of Health appointment can provide temporary healing and capacity benefits. Apply before a major battle or large healing session when the position is available in your state.
Use Event-Specific Capacity Rules
Some battlefields temporarily change normal Infirmary rules. For example, certain events may provide expanded capacity, Field Triage, automatic troop return, or separate recovery mechanics.
Always review the active event rules instead of assuming normal city-battle mechanics apply everywhere.
What Happens When the Infirmary Is Full?
Once the Infirmary reaches its capacity, it cannot accept additional severely injured troops through the normal process.
The Enlistment Office can save a portion of eligible overflow troops. Its capacity is based on your Infirmary capacity, and troops held there are recovered using Loyalty rather than normal healing.
Important: Do not assume every overflow troop will enter the Enlistment Office. Recovery rules depend on whether you were attacking or defending, the battle location, and whether an event-specific recovery system is active.
Before entering a major fight, check:
- Your current Infirmary occupancy.
- Your available normal resources for healing.
- Your healing speedups.
- Your Enlistment Office reserves.
- Whether Field Triage or another event recovery system is active.
- Whether you are attacking a city, defending, or fighting for a structure.
An upgraded Infirmary reduces risk, but it cannot make every type of troop loss recoverable.
When Do Refined Fire Crystals Start?
Refined Fire Crystals are first required at FC5-1, which is the first step between FC5 and FC6.
The first four FC5 intermediate stages each require:
- 40 Fire Crystals
- 2 Refined Fire Crystals
- 24 million Meat
- 24 million Wood
- 4.8 million Coal
- 1.2 million Iron
- 2 days, 2 hours, and 24 minutes of base construction time
The final FC6 step uses the same normal resources and construction time, but the special material cost changes to 20 Fire Crystals and 4 Refined Fire Crystals.
Later levels follow a similar pattern. Intermediate stages use more regular Fire Crystals, while the final full-level stage generally requires fewer regular crystals and more Refined Fire Crystals.
Whiteout Survival FC9 Infirmary Requirements
Progressing from FC8 toward FC9 requires Furnace FC9.
Each intermediate stage from FC8-1 through FC8-4 costs:
- 36 million Meat
- 36 million Wood
- 7.2 million Coal
- 1.8 million Iron
- 56 Fire Crystals
- 6 Refined Fire Crystals
- 1 day, 19 hours, and 40 minutes of base construction time
The final FC9 step uses the same normal resources and construction time, but costs 28 Fire Crystals and 12 Refined Fire Crystals.
The complete FC8-to-FC9 path requires 252 Fire Crystals, 36 Refined Fire Crystals, and approximately 9 days and 2 hours of base construction time.
Whiteout Survival FC10 Infirmary Requirements
Progressing from FC9 toward FC10 requires Furnace FC10.
Each intermediate stage from FC9-1 through FC9-4 costs:
- 42 million Meat
- 42 million Wood
- 8.4 million Coal
- 2.1 million Iron
- 70 Fire Crystals
- 14 Refined Fire Crystals
- 2 days, 19 hours, and 12 minutes of base construction time
The final FC10 stage costs the same normal resources and construction time, plus 35 Fire Crystals and 28 Refined Fire Crystals.
The complete FC9-to-FC10 path requires:
- 210 million Meat
- 210 million Wood
- 42 million Coal
- 10.5 million Iron
- 315 Fire Crystals
- 84 Refined Fire Crystals
- 14 days of base construction time
Completing FC10 raises the Infirmary’s base capacity to 121,500 wounded troops before research and temporary bonuses.
Reaching advanced Fire Crystal levels requires repeated Furnace, military, and support-building investments. Players comparing that progression with a more developed starting point may review a wos account for sale, while carefully checking the account’s state, Furnace level, Infirmary capacity, transfer eligibility, troops, and available resources.
Should You Prioritize the Fire Crystal Infirmary?
The Infirmary is valuable, but its priority depends on how often you fight and which progression milestones are currently blocking your account.
| Player type | Recommended priority | Reason |
|---|---|---|
| Peaceful or farming player | Low to medium | Capacity is useful, but Furnace and troop camps may provide more immediate progression |
| Casual PvP player | Medium | Provides additional protection during occasional battles |
| Active rally participant | Medium to high | Repeated combat can quickly fill a low-capacity Infirmary |
| Rally leader | High | Advanced troops are expensive to replace after permanent losses |
| Sunfire and State of Power fighter | High to very high | Large repeated battles can generate severe wounded-troop pressure |
Prioritize the Infirmary When
- Your Infirmary regularly approaches maximum capacity.
- You participate in frequent city, fortress, or castle battles.
- Your Furnace already meets the next requirement.
- Your essential troop-camp progression is secure.
- You are preparing for State of Power or Sunfire Castle.
- You have enough Fire Crystals left after protecting core progression.
Delay the Infirmary When
- Your Furnace is blocked by missing materials.
- Your required troop camps are several stages behind.
- You rarely participate in PvP.
- Your current capacity is rarely used.
- Spending Refined Fire Crystals would delay a more important milestone.
Best Upgrade Order for Most Players
A practical Fire Crystal building order is:
- Furnace: Unlocks the next city progression tier.
- Required troop camp: Unlocks stronger Fire Crystal troop development.
- Embassy: Supports alliance help and is required by other advanced buildings.
- Command Center: Improves rally and march capacity.
- Infirmary: Expands wounded troop protection.
This order is not fixed. Active fighters may move the Infirmary above the Command Center or some troop-camp stages when overflow losses become a recurring problem.
How to Heal Troops Faster
Capacity determines how many troops can be stored, while healing speed determines how quickly that space becomes available again.
Research Bandaging
Bandaging is found in the Growth research tree. It reduces healing time and is one of the most useful support technologies for active fighters.
Use Alliance Batch Healing
During an active war, healing troops in smaller batches allows alliance members to provide help repeatedly. This can complete several smaller healing queues faster than one extremely large queue.
The ideal batch size depends on:
- Your alliance activity.
- The number of available helps.
- Your Embassy help limit.
- Your healing speed.
- How quickly you need troops returned to battle.
Apply for Minister of Health
Use the Minister of Health appointment before a large healing session when possible. Coordinate with state leadership because availability may be limited during major battle periods.
Maintain Healing Resources
A large Infirmary is not useful when you cannot afford to heal its occupants. Keep protected reserves of Meat, Wood, Coal, and Iron before major battles.
Request Alliance Help Immediately
Request help as soon as a healing queue begins. The reduction is especially valuable when your Infirmary contains high-tier troops with long recovery times.
Best Event Timing for Infirmary Upgrades
Fire Crystal Infirmary upgrades can provide construction power and may contribute to event scoring. Therefore, completing them during a relevant construction or power-growth phase can provide additional rewards.
A practical event strategy is:
- Save the required resources before the scoring phase begins.
- Activate available construction bonuses.
- Begin the Infirmary stage during the correct event window.
- Request alliance help immediately.
- Use construction speedups only when the reward value justifies them.
- Avoid delaying essential capacity before an imminent major battle.
Event timing should improve the value of an upgrade, not prevent your account from progressing for several weeks.
Fire Crystal Infirmary Strategy for F2P Players
Free-to-play and low-spending players should balance survival capacity against Furnace and troop progression.
A practical approach includes:
- Keep the Furnace as the primary progression target.
- Upgrade the Infirmary when capacity becomes a real limitation.
- Research Ward Expansion before spending heavily on optional building stages.
- Prepare Refined Fire Crystals before beginning FC5-1.
- Use construction buffs and alliance help on every stage.
- Avoid unnecessary city attacks when the Infirmary is already occupied.
- Heal before State of Power, Sunfire Castle, and fortress battles.
- Save normal resources for post-battle healing.
For F2P players, preventing unnecessary losses is often more valuable than gaining a small amount of additional building power.
Fire Crystal Infirmary Strategy for Active Fighters
Players who fight frequently should keep the Infirmary closer to their Furnace level.
Before a major battle:
- Clear existing severely injured troops.
- Check your current base and bonus capacity.
- Apply for useful state appointments.
- Prepare healing resources and speedups.
- Confirm the event’s casualty and recovery rules.
- Coordinate batch healing with your alliance.
- Shield or withdraw when your capacity is nearly full.
High-tier troops require substantial time and resources to replace. Increasing recovery capacity can protect months of troop development.
Common Fire Crystal Infirmary Mistakes
Counting Only One Sub-Level
Every full FC milestone requires five construction stages. For example, reaching FC1 costs 130 Fire Crystals, not 26.
Assuming Every Overflow Troop Is Recoverable
The Enlistment Office can recover eligible overflow losses, but battle and event rules differ. Some losses may remain permanent.
Entering Battle With an Occupied Infirmary
Starting a large fight while the building is already partially full reduces the space available for new severely injured troops.
Ignoring Ward Expansion
Building upgrades are not the only source of capacity. Leaving Ward Expansion unfinished can significantly reduce your total wounded troop limit.
Ignoring Bandaging
Additional capacity solves only part of the problem. Slow healing can leave the building full between consecutive battles.
Spending Every Fire Crystal on Support Buildings
The Furnace and troop camps control major progression milestones. Protect their required materials before committing to optional Infirmary stages.
Preparing Refined Fire Crystals Too Late
Refined Fire Crystals are required beginning at FC5-1. Waiting until FC5 is complete can create an avoidable progression delay.
Upgrading Only for Power
The building adds power, but its real purpose is troop recovery. Upgrade it according to your combat activity and capacity needs rather than the displayed power gain alone.
FAQ
What does the Fire Crystal Infirmary do in Whiteout Survival?
It increases the number of severely injured troops that can be stored and healed. It also adds building power but does not directly increase troop combat stats.
How do you unlock Fire Crystal Infirmary upgrades?
Your regular Infirmary must reach Level 30, Fire Crystal content must be active in your state, and your Furnace must meet the requirement for the target stage.
How many Fire Crystals are needed from Level 30 to FC10?
The Infirmary requires 2,314 regular Fire Crystals and 174 Refined Fire Crystals from Level 30 to FC10.
What is the FC10 Infirmary capacity?
The FC10 Infirmary has a base capacity of 121,500 troops before Ward Expansion research, appointments, and temporary bonuses.
When do Refined Fire Crystals become required?
They are first required at FC5-1, which is the first intermediate stage between FC5 and FC6.
What happens when the Infirmary is full?
New severely injured troops cannot enter normally. Eligible overflow troops may be sent to the Enlistment Office, while others may become permanent losses depending on the battle and event rules.
Does upgrading the Infirmary unlock Fire Crystal troops?
No. Fire Crystal troop progression comes from upgrading the Infantry, Lancer, and Marksman Camps. The Infirmary only improves wounded troop capacity and building power.
Should F2P players prioritize the Fire Crystal Infirmary?
F2P players should prioritize it when capacity frequently becomes a problem. Otherwise, Furnace and essential troop-camp progression usually provide greater immediate value.
Conclusion
The Whiteout Survival Fire Crystal Infirmary is an important late-game support building for players who want to protect more troops during PvP and large alliance battles.
Progressing from Level 30 to FC10 requires fifty construction stages, 2,314 Fire Crystals, 174 Refined Fire Crystals, more than one billion Meat and Wood, and over 97 days of base construction time. In return, base capacity increases from 66,500 to 121,500.
For efficient progression, keep your Furnace ahead of the Infirmary, research Ward Expansion and Bandaging, prepare Refined Fire Crystals before FC5-1, and avoid entering major battles with partially occupied capacity.
Most importantly, treat the Infirmary as part of a complete troop-recovery strategy. Building capacity, research, healing speed, alliance help, event rules, and resource preparation all determine how well your army recovers after battle.
Explore the Whiteout Survival guide category for more building, event, hero, resource, and progression guides.
