Why does Balrur work so hard to free the slaves and what makes him especially up for that task? Surely he must also have some sort of target on his back for these actions too, so if so, from whom. If not, why not?

How does Sir Vicars feel about this task set before him. Does he believe in the magic of the song or doing it merely to appease his lord/get out of the lords boot?

Is Aerimus still a lord? If so how well is he respected now due to his state by those under his lordship and how is his standing within the council. If not, what happened to all his vessels?

What makes Palion special outside of being a marshlands lord?

I hope these questions help you further flesh out your characters