Haven't done MSQ yet, but the Cylva quests:

When I read there would be a quest requiring both the role quests and the Warring Triad, I knew Cyella and Unukalhai would be reuniting. However, I expected Cyella to come to the Source, not Unukalhai to go to the First. I liked Cyella's description of each of the Thirteenth's heroes trying their own way to save their world instead of as a team, I'd read a short story about it.

When Taynor said Unukalhai's aether is familiar, I wonder if that means Unukalhai is either Taynor's shard or Nyelbert's shard. He and Taynor do have the same eye color... Assuming they are shards, I wouldn't be surprised if having them merge is how they'll solve the problem Urianger foreshadowed regarding Unukalhai's body.

This definitely feels like a story we're going to come back to in the future. I actually am wondering more and more if 6.x will be going to the Void after all.