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I know that it costs a category point, which is awarded every 10 levels but I just cannot find the UI element that lets me purchase the additional slot. How do I do it?

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Maybe the UI has changed since 2012, but there's an "Inscriptions" button on the level up screen which you can press to add another slot (assuming you have a category point available). – Sterno Jan 14 '15 at 17:39
up vote 1 down vote accepted

Just go to a rune/inscription in your inventory and select use on it, it will ask you if you want to get an additional slot.

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