🔥Furnace & City
The Furnace gates almost everything: building levels, troop tiers and new features.
TL;DR Push the Furnace first. Build only the prerequisites its next level asks for, plus the Research Center and troop camps.
🧱Build priorities
- Furnace first. Check the next level’s requirements early and start those prerequisites on your second queue so they’re ready when it finishes.
- Research Center: upgrade it when its level blocks research you want, and keep it busy.
- Infantry, Lancer and Marksman camps are upgraded separately. Raise them to match the troop tier you want.
- Embassy: keep it near your Furnace level. It gives Alliance Assists and reinforcement capacity.
- Infirmary before big PvP events; the Command Center if you lead rallies.
- Resource buildings are filler. Upgrade them when a queue would sit idle, a prerequisite needs them, or you’re short of a resource.
- The second construction queue is a one-time store pack. It only pays off if you can keep both queues busy.
💎Fire Crystal era (after Furnace 30)
| Stage | What changes | Tip |
|---|
| Entry | Furnace 30, plus a server that has reached its first Fire Crystal Age (around server day 60) | Bank Fire Crystals from events before it opens so you can climb fast. |
| FC1 – FC10 | The Furnace climbs through sub-levels (FC1-1, FC1-2…). Camps and other buildings have FC prerequisites too. | Check which camp the next Furnace step needs before you spend. |
| Refined Fire Crystals | Start showing up in building costs around FC6–FC8. The Crystal Laboratory (around FC4–5) refines them. | Refining is rate-limited, so start early and keep it running. |
| War Academy | Needs FC5. Unlocks T11 Helios troop research, then T12 Exalted and Molten research (added in 2026). | Helios research is paid in Fire Crystal Shards, which have a daily cap. |
Exact Fire Crystal costs differ between sources and change with patches. Check the in-game requirements.
👥Survivors & weather
- Keep survivors warm, fed and healthy. The furnace burns coal, and a cold city makes survivors sick.
- Blizzards are server-wide cold snaps that test your heat. Top up coal and furnace output before you log off.
- Assign workers to the production you are short on.