The storage is an account wide inventory in which you can deposit and withdraw items and zulie.
In each town there is one NPC who can unlock your storage, you may also want to use the Storage Scroll to open your storage.
When placing an item in your storage a fee will be required, you can check the fee per item when hoovering above an item in your inventory with your mouse.

Storage NPCs and Locations

Adventurer's Plains   [Ferrell Guild Staff] Rooen
Canyon City of Zant    [Ferrell Guild Staff] Crow
Rocky Ridge   [Ferrell Guild Staff] Hector
City of Junon Polis   [Manager of Ferrell] Arothel
Magic City of the Eucar   [Ferrell Guild Banker] Andre
Xita Refuge   [Storage Keeper] Dustin Leta
Heliopolis   [Ferrell Guild Banker] Urtharo
Ramessess Workings   [Ferrell Guild Banker] Urtharo
Last Sanctuary   [Ferrell Guild Merchant] Milton


Storage tabs
When opening the storage you have Storage tab 1, 2, 3 and 4 in which you can input any item you desire and with in the storage you can drag items to diffrent storage tabs.
Each tab contains 40 item spaces with a total of 160 item spaces.

Extra & Item Mall tabs
You will also notice the two other storage spaces called Extra and Item Mall, when clicking on them you will also see Extra 1, 2, 3 and 4 and the same goes for the Item Mall 1, 2, 3 and 4.
The Extra tabs can be unlocked using a Storage Expansion Coupon which allows you to use the Extra tabs (160) spaces for the duration of the coupon last.
Item Mall spaces can be used exclusively for [Premium] items, items bought from the item mall.

If you can’t remember you placed a certain an item in your inventory use the search button that can be used to track items in your inventory by name.

The zulie can be placed and withdrawn from your storage using the buttons, the amount required can be placed in the popup window.
You can also use the Backspace key on your keyboard to remove some of the amount you typed in the popup window.