'The Rolling Mists' are not mists. This was a lie. The Rolling Mists are waves. They are the ocean. New pathways are uncovered and old ones covered all the time. (As history of our own world can show us.) I'll elaberate on this later.
Anyway, now that i'm back, i'll talk more about my ideas on the Rolling Mists...
Lets see, they become red as they reach up toward the sky... is there any evidence to suggest that this guy saw the Rolling Mist more then once? Maybe there was a large battle and the ocean was filled with blood... actually, I have no clue on the red of the mists. But the mists reaching up toward the sky and not being able to escape seemed very waveish to me.
Venge is not evil or good. Etc.
I believe it was established in the game that Venge was the son of the Lord Below. But it never went into Venge's personality, just glimpses that we see in Rhue. Of course, Rhue is very Chaotic Neutral/Evil.
You know.. how do we know the Lord Below isn't human himself? He could be an incredibly powerful Wanderer. Like.. hmm.. nah, theres no basis for that.
Lets see, I think i'll go into Jeruh. Jeruh was a regular child who loved Serena, and Serena was evil and manipulative like the average girl. Midian seemed like a popular badboy type guy, and Jeruh was kind of a made fun of nerd who finally snapped. He found some sort of sword and two shadows.
This sword was, I believe, Ghost Horror. Ghost Horror feeds on anger. He increases your anger to destruction. He loves kids.
The shadows? Tetzel and Eshyau. Tetzel killed the only Forerunner because he knew too much with his current Shadow Sword, Ghost Horror. Tetzel went catatonic as he battled Eshyau in his head for dominance, at this time Jeruh came out and took Ghost Horror, twisting him into the murderer.
Jeruh killed Serena and Midian trained to kill Jeruh and made it his lifes work. Jeruh was hunted by law people like.. lets say, the Vigilante Council if it existed then and the Guided and, by extenstion of that, Gaius. Midian fought Jeruh and it was at this point the Shadow Sword got away from Jeruh and Jeruh came to himself, realizing what he had done and went into hiding. He made the Rhue personality, but knew he was only fooling himself until 'Rhue' killed him and took the 'Rhue' personality, but had no idea of the backing up 'Jeruh' personality so he did not know he was fooling himself.