Do all your books take place in the same world or if they don’t how do characters/objects travel between worlds e.g. Nightblood, Zahel/Vasher??
They are on different worlds, but in the same universe. There are clues throughout (starting in Elantris ) about how people jump between planets. It will be more clear in the future, but you might want to google the “cosmere” and read what people have theorized so far.
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