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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. The Stronghold needs to be updated to level 21 and only one Iron Storage can be converted on that level. On Stronghold level 22 an additional Iron Storage can be converted.

With the upcoming Stronghold levels, maybe more can be converted.

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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