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The advanced iron storage allows you to store more iron. It is an advanced structure that can only be converted from a level 20 iron storage. Once the Stronghold is upgraded to level 21 one Iron Storage can be converted. At Stronghold levels 22 and 24 another storage can be converted for a total 3 Advanced Iron Storages.

Level Increase Capacity
1 27000 484k
2 13000 497k
3 13000 510k
4 13000 523k
5 14000 537k
6 13000 550k
7 15000 565k
8 14000 579k
9 15000 594k
10 15000 609k
Upgrade Costs
Level Iron Req Time
1 1502k 10s
2 1598k 2d 6h
3 1700k 2d 21h
4 1812k 3d 12h
5 1920k 4d 5h
6 2013k 4d 23h
7 2135k 5d 22h
8 2275k 6d 21h
9 2325k 7d 20h
10 2407k 8d 19h
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