[Coldsaturn]

Yeah, I noticed the many rivers thing as well, but since she didn't mention just how many there are (and in Abysswalker there were MANY) I let it slide as a generic "we're in the same place"

Good guess, it is Zayne!

YES on Lethe and not Styx. Or an amalgamation of both.

I swear I had written a comment on the Feeble Revenant giving it his all in the performance but I have no idea where it ended up.

I'm not sure a king was actually made to kill himself. I read it to mean they came to make him do it, but the king instead defeated them all and fused the swords on his throne GoT (the actual GoT) style.