It may surprise you to learn that you can find Halo Infinite multiplayer skins and other cosmetic items in the single-player campaign. You can find them in the open world by capturing FOBs, which ping the skin location on the world map. Once highlighted on your map, it’s just a case of finding the Mjolnir Armory cases and opening them up to get the item.
However, not every one of these caches contains armour coating. They can also have weapon skins, vehicle skins, emblems, nameplates, charms, and stances. Once you’ve opened a cache, you can equip these items to your character in multiplayer mode. To learn more about how to do this, check out our Halo Infinite character customisation guide.
You could just go and open every one of the Mjolnir Armory caches. However, we’ve separated all items into their relevant categories should you wish to prioritise the Halo Infinite multiplayer skins or any of the other unlockable items. In addition, some of the caches are hard to find, so here’s a description of their location.