I wanted to throw some theories out there. Forgive me if these has already been posted but I have not seen all of them somewhere.
First I think that Cultivation is the big face in the storm. I don’t think it was Honor and I definitely don’t think it was Odium. Dalinar’s dreams were more wrote and looking back it make sense that they were “recorded” in the past. I think that the big face in the storm is still living and it makes sense to me that it was Cultivation. The question I have though is that it makes more sense that the storms are cause by the remnants of honor like the mists were Preservation) but Cultivation appearing in Honor’s storms don’t make as much sense. I still think the face is Cultivation.
Also I read somewhere that Cultivation is older so the old magic that Dalinar visited and lost the memory of his wife probably came from Cultivation although it is a pretty nasty spell so maybe it comes from Odium
I also think that only Cultivation, Honor and Odium have been on that planet but that Odium is not currently on the planet. I know some people think that there is another, a third (and Odium is not the third) because of a quote from Brandon Sanderson. I don’t know where I saw the exact quote but the way it was phrased it made be believe that at some point in time there were three shards on the planet and Odium being there, then leaving would fit the way Brandon Sanderson said it.
I also think that Odium takes over the Parshendi to make them become voidbringers. Much like Ruin took over the Inquisitors, I think Odium takes over the Parshendi through their songs. That is how he controls them and they become like automatons. Perhaps in that last desolation they were not only able to beat the voidbringers but someone kill their songs. Maybe that is what brought Honor down, when they did someone so dishonorable as stopping the ability for Parshmen to sing songs. (Oh, the singing songs reference comes from the latest reading by Brandon Sanderson when he reads a passage from the point of view of the Parshendi)
I also think that the Radiant Knights abandoned the people once they decided to take the Parshmen as slaves. That is why they abandoned the people, because the people had no honor and there was no sense in defending them. Perhaps that is what allowed Odium to kill honor, when honor’s people created slaves and the Radiant Knights left.
So I think that the Heralds go somewhere to keep Odium off of the planet. They fight to keep Odium’s affect off of the planet and from taking over the Parshmen. The Herald that appeared means the Odium is back or that his influence is now back on the planet and the Parshmen are about to be taken over again.
- Shardless