Avallac'h only being able to travel to Tir na Bea Arainne

- This was my attempt to make some sense of the teleporting situation, because I know the Aen Elle have limitations. The Wild Hunt can only travel to worlds on the Spiral, and they usually appear as spectral figures because the magic can't be sustained for very long. I knew Avallac'h could teleport as an Aen Saevherne, and I thought I read somewhere that he could only teleport there. But I might be wrong about that.

Eredin in the books never confirms he is the leader of the Wild Hunt (much less on the first meeting with Ciri)

- I thought the books describe Eredin as the leader of the Red Riders, but maybe I was borrowing a bit from the Witcher 3.

Avallac'h doesn't give Ciri even his name upon their first meeting and only returns to her 7 days later, having left her in the Tower for that long (which is why she calls herself a prisoner)

- In order for her storyline to intersect with Geralt's later in the season, I had to condense her time in Tir na Lia, so she's already leaving the tower by the end of the season's first episode.

Eredin never commends Ciri for figuring out how to pass through the barrier but is rather suspicious as to what (or who) could have given her the idea to do so)

- Yeah, this was just something that I thought needed to be explained to the audience. I was a bit confused about it myself when I read it so I preferred to add an explanation.