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1st Wave
Fragment of a discussion from Talk:Shadow Mission Captain Assembly
The chosen Boss seems to be randomized. The one time that I was able to enter (but lag prevented the Shadow Missions form progressing any further) , Claimh Solas appeared to fight against.
However, I do remember seeing a few other Bosses shortly before Claimh was chosen, such as a giant Fox Doll, Arc Lich, and about two others who I forget.