Unfortunately, there aren't any daedric quests in Dawnguard or Dragonborn that would provide you with a missing artifact.
you might be missing the prince of plots , or dreams i forgot lol but the ebony sword behind the mysterious door that requires ten kills of humans differentt races power the sword ect. that one Oxescarecrow (talk) 07:12, February 13, 2013 (UTC)
Sadly no there are no more daedric quests involved. Also on another note, avoid getting Dawnguard until you have Oblivion Walker, it usually glitches and make the trophy impossible to unlock.