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NWN: official sequel to SoD?
It occurs to me that Siege of Dragonspear was left with loose ends (e.g. Soultaker Dagger and Chrystal Casket) to set up a sequel. However, as SoD was not as well received as hoped an Infinity Engine follow-up (aka BG3) looks unlikely.
However, a sequel could be done as an official expansion to NWNEE. Beamdog presumably still own story treatments, even though some of the writers have changed.