Master smith, Grámi Hornhelm, wants Máttugard cleaned up and the light shining throughout as bright as ever.
'The years of Máttugard left unoccupied by dwarves have made the Great Court a dusty court indeed. The thick layer of filth on the mirrors dims Gundabad and may even prevent the mirror traps from springing! Bah! We can fix this, but it will take some work. When next you are traversing Máttugard, take a moment to clean some of the mirror traps. It will help immensely!'
Mirror traps can be found west of Maergrind.
You should polish any dusty mirror traps that you find.
Polished dusty mirror traps.