Mopman was saying that it is either a custom or an oath that leads to it being secret. It can't be an oath. There's far too many people that need to be covered by the oath for that. Many people who weren't even Runesmiths should have been able to guess what all the work was being done for. Many of those people would have been outside of the Royal Clans or Runesmith's Guild, unlike Borek. There's no point in making it an oath: it'd be impossible to ensure no one outside of the oath knew of it. Therefore, it must be a custom.Karag Dum knowing does not necessarily mean it is custom.
It shows that Karag Dum knew, but then every hold, every king, and every Runelord presumably knew at one point.
And Karag Dum were known to be radicals (and the information never spread beyond Karag Dum for whatever reason).
But knowledge gets lost, people die before it gets passed on, or the apprentice is judged unworthy, or any number of other reasons why something like this gets forgotten when it is not written down, or even if it was written down but the writings were lost when the mountins got re arranged.
Thorek and Mathilde didn't even bring up the possibility the High King could not share what the magic was doing because of an oath. That's because it would make absolutely zero sense to be an oath, rather than custom.
Edit: Karag Dum knowing shows that it was not something that the High King bludgeoned through and used the authority of Karaz-a-Karak to get the holds involved to not ask questions.
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