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The Stronghold is a the primary structure of your Base.  Its level determines the level to which you may level up all other buildings.

It may be upgraded to a maximum of level 23 and gains additional space in which to build, along with the corresponding possible buildings to fill those spaces, at the following levels:
Stronghold

Stronghold



Stronghold Upgrade Space
Level New Buildings
3 Farm, Mine, Food Storage, Forge
5 Farm, Iron Storage, House, Training Camp
8 Farm, Mine, Iron Storage, Forge
10 Unlock Barracks*
11 Farm, Food Storage, House, Training Camp
15 Farm, Mine, Iron Storage, Forge
20 Farm, Food Storage, House, Training Camp
21 Unlock Hunter's Lodge and Advanced Buildings**
22 Allows to convert second advanced budilings.***
23 Unlocks Alchemy Lab****
  • Stronghold Level 10:  Barracks, Hunter's Lodge, and buildings labeled 'Advanced' are each Advanced Buildings.  These buildings Convert already-leveled buildings into the Advanced one.  See each individual page for more information on its own requirements for Conversion.  Because of said conversion, no new building slots are acquired at SH level 10 or 21.
Upgrade Costs
Level Iron Cost Time
2 4,900 1m
3 12,300 10m
4 26,500 55m
5 47,700 2h 15m
6 75,600 4h 25m
7 113,000 7h 35m
8 162,000 11h 45m
9 228,000 17h 5m
10 301,000 23h 35m
11 388,000 1d 7h
12 489,000 1d 17h
13 619,000 2d 3h
14 753,000 2d 15h
15 903,000 3d 4h
16 1,073,000 3d 19h
17 1,260,000 4d 12h
18 1,490,000 5d 6h
19 1,729,000 6d 2h
20 1,969,000 7d
21 2,108,000 8d 1h
22 2,367,000 9d 4h
23 2,439,000 10d 9h
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