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They all have a couple of layers of information: a story-snippet about the item being used by someone, once upon a time; light details about where it came from or when; and mechanics for play.
All the items are intended to be either low-level useful (any +1 sword is going to be generally preferable over the items) or have a dramatic and big effect that only happens rarely or with great risk. They're pretty play balanced.
Feel free to take and borrow!
I appreciate the work that's gone into this. It's good stuff.