[the REAL Minos Prime]

Man, why would we cater the worldbuilding around some mechanical stuff? Putting instant teleports would ruin Korvara. Caravans would improve the world's feel and immersion, while mage guilds would be weird as hell and remove immersion while also massively reducing the chance of encountering people outside of cities. It would be especially jarring if nations can't even control it. The crystal teleport is already dubious in-character because there's no way in hell every person on korvara can use those. Logically speaking, there's no reason an army couldn't pass through crystals, so we have to just pretend it doesn't exist. Let's not water down korvara even more with teleports... That defeats the whole point of korvara.

If your character wants that book or doohickey badly enough I see no reason why they wouldn't travel by normal means.

In G6, it was explained that the Mage's Guild refused to participate in wars and could not transport large quantities of goods. Nemalyth, being a sentient being, could simply refuse to move armies around, and much like the Mage's Guild, be incapable of moving large caravan-like quantities.

And remember - not everyone in Korvara can even talk to her. Just crazy loons willing to jump into a monster-infested cave and grab a silly rock, and then treck across the continent looking for silly crystals if they want the memory crystals, something the average Korvaran would not be willing to do.