IIRC, talking to the Shadow Prince gives some insight into his motives and plans, but doesn't progress any quest. You might have missed his explanation as to why he did what and so on, but nothing too spectacular.
I can't find any entry called "Redemption" in my log book, but it appears that you're done with this one once you've found Sadha in Arc 2. Then once you've wrapped up everything with Sadha in the dream world, that's pretty much it. She's free and you get a special summon, and you just carry on with your quest for divinity now.
Last edited by Try2Handing; 10/11/17 03:38 AM.
