Duskmantle was the guildhall of House Dimir on Ravnica during Szadek's reign. It was a hidden castle located in the Undercity whose location was only known to its residents. After Szadek's demise, both the location and way of gaining entry were lost. Lazav recreated the structure in a different part of the Undercity, shielding it with potent memory wards (not unlike those of the original guildhall).
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