I think the point here is that the GM has to agree with the stakes first - it's not that the roll is made and then on a success the player has free rein to say what the runes are, it's that the players and GM before agree that the request is reasonable (so authorship is shared) so on a success the table gets the shared authorship result, on a failure they get what the GM authors alone.They way it seems to me, is if it's not really a valid move to deny the players idea if he makes successful roll, what the roll does is determine who is authoring the runes. If the roll is successful, the runes say what the player wanted them to say. The DM doesn't really author the runes unless the roll fails.
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