Mostly, I choose an earth culture (or two) to base my linguistic influences on. For instance, in the Mistborn books, I used French. It’s obvious in words like Fellise, Renoux, Blanches, Delouse and Demoux. Less obvious is Kelsier, whose name would be pronounced in-world without the last R sound.
Do you think you’ll ever develop a language like Tolkien did?
Maybe. I did a lot of that in White Sand, which didn’t get published. I’ll do more for other books.
Do you use Hebrew words?
The name Adonalsium is derived from a Hebrew name for God, Adonai and Aharietiam was derived from the Hebrew/Jewish term for the end of days acharit hayamim or אחרית הימים