Eliana Keylocke

Curious to know if Moash having Voidlight eyes was in any way related to his connection to Odium? Also, could you theoretically use Hemalurgy/Gemalurgy on spren?

I don't know if Kelsier would try to take Harmony's shards, because he's seen the inability that comes with it and is misaligned with Preservation. However, I do think he would be a good fit for Autonomy. If he managed to kill Bavadin and take that Shard, he would also have a chance to get off-world like he's been wanting to. If he could somehow manage to defeat Taravangian, the concept of Retribution would also fit him quite well. I'm not sure what the Autonomy/Retribution combo would be called... something implying vengeance and individualism?

Unless you can allomantically burn it...

I think Brandon mentioned at some point that Roshar has a magnetic field, so maybe if there are some magnetic-space spren they could unite and form a shield? I think Kaladin or other Heralds might also be able to do something, since they are Connected to Roshar in a way that others aren't. And it really depends on what's going on with Retribution at the time. *Adds more ingredients to cracked pot*

I don't know about the Sunheart illustrations, but I did find a short description for Ambush: "Nomad and Rebeke realizing that Unity has come to ambush Beacon". This can be found here: https://coppermind.net/wiki/File:Ambush_by_Ernanda_Souza.jpg. I believe where it says "Unity" they meant "Union" (the Cinder King's city).