In Birthright of the Dwarves, he is accused of being a Red Axe spy, and players have the option of either letting him go, exiling him, or killing him. If spared, he may once again be found within the King's Axe Inn, and if exiled, he may be found south of Yanille.
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Klaas is a Dutch name.
After the dwarf graphical update, he looked completely different when sitting down to how he looked when standing. This was fixed with the release of Birthright of the Dwarves post-quest dialogue.