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?

  • 1
    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, 2015 at 17:39

1 Answer 1


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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