Agreed with the comment to get rid of it as a junk item, or add flavour text to the effect of "Known to be a legendary item to many adventurers, of no use to you."
Rope has strong connotations in D&D as being extremely useful, I get the wink and nod to it but when the game has a lot of interactions, having an item with the reputation of rope in D&D but never actually useable isn't ideal.
