A Fortunium strongbox is a special type of strongbox, like the Neptunium strongbox. However, it is not as rare as a Neptunium box. It has a guaranteed chance of dropping a black key or an elite core, and any red or black weapon. There is a 1% chance that when a Promethium-Nanotonium strongbox drops, it will be turned into a Fortunium box, Meaning that steel-neodymium boxes have no possibility to be turned into a Fortunium strongbox.

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