Lemon sole runes are items used in Back to the Freezer. They are made by using Pure S-now on the Sole Altar in the secret bunker in the past, after the altar has been cleaned by a lemon. They are required by Elon, as specified by his list.
- The name is a reference to soul runes and the lemon sole, a flatfish native to northern Europe.
- The number of runes required, 1985, is a reference to the year Back to the Future was originally released.
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