The Steel Sword Charm is a rare resource used for crafting perks on items in New World game.
Description: Crafting item with a weak attunement to Sword weapon traits. Has a max stack size of 10000, weights 1 and is tier 1.
Here is how to obtain:
This is listed as coming from "War" as a reward of some kind or resource.
Item Class - Resource Perk Resource
Trade Family - Special Resources
Trade Group - Conditional