Acquisition
Understone Keep in Markarth, in the last room of Calcelmo's Laboratory. It is to the right when facing the door to the balcony. When using Destroy the Thieves Guild, the cube will instead be in Birna's Oddments in Winterhold. It can either be bought or stolen.
Notes
Picking it up will add a miscellaneous task to take it to Delvin Mallory, who will pay a leveled amount of money for it.
Normal Location
Calcelmo's Laboratory in Markarth
Location in Calcelmo's Laboratory
Calcelmo's Laboratory map
Markarth city map
Markarth on map
Destroy the Thieves Guild Location
Birna's Oddments in Winterhold
Location in Birna's Oddments
Birna's Oddments map
Winterhold city map
Winterhold on map