Independium is a special currency for this event which you can earn by participating in various activities throughout the update. Here’s the full list of sources:
Pacific Hammer Campaign: 2,000 Independium without the Admiralty Backing and an additional 3,000 Independium with the Admiralty Backing.
“Big Chief” Calendar: 3,000 Independium.
“Steel Eagles” random bundle in the Store: up to 50,000 Independium (any drop comes with 500 Independium).
And here’s what you can exchange Independium for:
“The Righteous Fury” chained bundle, featuring skins for the U.S. alternative destroyers, with the Legendary Tier destroyer Burrows available in the final bundle and also equipped with a special skin.
Ship skins inspired by three historical eras:
“For the Constitution” skin for the U.S. cruiser Cambridge inspired by the frigate USS Constitution, which sailed during the Age of Expansion. Cambridge is a new ship you can obtain from the “Steel Eagles” random bundle (find more details about the ship at the end of this article).
"White and Gold” skin for Indiana, inspired by the Great White Fleet. Indiana is a new ship you can receive by completing the Pacific Hammer campaign.
"Dazzle” skin for Worcester, inspired by experimentation with dazzle camouflage during World War I.
“Golden Eagle” skins for Kansas and Florida, and “Star-Spangled Freedom” skins for Baltimore and Cleveland.