Despite not being available as a card in Clash Royale, the Gold Storage can be seen in the Jungle Arena arena as a decoration.
The Gold Storage is upgraded using Builder Elixir.The Gold Storage stores the same amount of Builder Gold as Builder Elixir in Elixir Storages of equal level.The Gold Storage is still entirely functional when upgrading.The Gold Storage stores Builder Gold, a resource which is used for constructing and upgrading buildings in the Builder Base.
#COC BUILDER LEVEL 7 UPGRADE#
Don't let sneaky goblins anywhere near! Upgrade the storage to increase its capacity and durability against attack."