Honestly if this had been its own trilogy in a completely different world setting it might have worked better for me. The author was trying to build a world that she had already created and didn't need to expand in such a big way and the result was that it fell short.
This book floundered in the beginning as Ulla tried to figure out what to do. Not only was she as a character lost but so was the story. The characters themselves were interesting, they just weren't written in a way that utilised their full potential. Ulla isn't conventionally attractive (at least in her opinion), she's plus size and not perfect but she is strong willed and loyal. Unfortunately for her the fact that she never has any idea of what to do despite being the main character makes this a little hard to read, especially if the author was trying to lay down clues for later in the story. Wendy, the original main character from the Trylle trilogy, was suddenly portrayed as weaker than she actually is. Most of for Brynn, the main character from the Kanin chronicles, this story diminished her original story and efforts to prove herself during her own trilogy. The author's attempt to connect her to this trilogy and Ulla ended up making it a story more about Brynn than Ulla in the first half of the book until she suddenly disappears until the final battle at the end. Her death was pointless and didn't further the plot or add anything to the story other than shock value. In fact she was made to seem weak in the final battle as well when she tried to attack the wyrm and her sword only bounced off its scales. It's head was right next to her, as if she wouldn't have thought to try stabbing it in the most vulnerable spot possible, the eye!
Mastare Amalie was suspicious for no reason in the end. She was supposed to come off as someone who was super interested in the history that Ulla was, apparently, unearthing but instead she came off creepy. Also there was no build up or explanation for the Korva being an Alvolk, it would make more sense for Amalie to be the "inside person".
Why was Finn in every trilogy? Why was he always the connecting factor? It was cool for his sister to be in the Kanin chronicles but this was a bit much. Surely there can be another way to get in contact with Queen Wendy? The update on the characters was kind of cool at first but then the random connection of Hannah's grandfather being Jemkruk's brother felt really forced and like a desperate attempt to explain the way time works differently across the bridge. Also it was a way to dump off Sumi and Jemkruk in Forening until the final battle without them actually having to do anything.
And ew! What was the point of adding in that Jemkruk apparently loved Ulla's mother, especially after he'd been flirting with Ulla? His death also added nothing to the story . His character barely served a purpose other than to conventiently appear at random times to explain the plot.
Rikky, Pan's ex, honestly deserved better than to have Pan as her ex. There was no reason to have a scene where she yells at Pan because he didn't tell her about liking Ulla other than to create drama. Drama can be good but not when it doesn't add anything to the story. She was right about him being a coward though.
Pan's character however became more ridiculous as the story went on because he only existed to BE the love interest to Ulla. He had a personality in book 1 but it vanished the second he and Ulla started become an "unofficial thing". He kisses her, or tries to, in every scene they're in regardless of how she's feeling which feels uncomfortable to read when she's tired and by all means doesn't seem to want to do something like kissing in that moment. Not only that bu he mostly repeats himself about "starting and finishing the journey together". That's it. I genuinely cannot get over how short their sex scene was either. Now, I'm not saying that I want a full on show or anything but this felt very uniform. Ulla did this, he did that and done. At least they used protection I guess. Why bother including it when they were such a barely there, on and off couple the whole time? Plus, at the end when he decides to travel the world with Ulla (and her extremely convenient and honestly ridiculous amount of Will money from Brynn that solves all of Ulla's money problems) its so out of character because his whole thing was the Inhemsk program and just because apparently the history of trolls is different to what they all thought it was doesn't mean there aren't still fractured and displaced families out there! It was also a little weird that both Ulla to be unacknowledged and long lost children of royalty; royalty that apparently doesn't even matter anymore, and they just happen to "fall in love".
The alternating points of view at the end was clearly for dramatic effect for the battle. If there were going to be alternating POVs at all it should've been throughout the entire book and possibly the entire trilogy. It might've added more depth to it.
I don't like that all it took to kill the wyrm was a "flaming" dagger to the eye that only Ulla could do. It was so anticlimactic and made Brynn's death feel silly. The "plan" that Ulla had for killing it wasn't even a plan and the whole song line "The suns set in the green sky when the good morning becomes the violent night" did not make sense. The line did not serve a purpose or lead into the battle or plan to kill the wyrm or anything. It was never explained or made relevant other than being an annoying song stuck in Ulla's head to represent the fact that her memories were gone. And oh yeah wtf was with the spiders being in her memories? Like why would the Ogonen manipulate her later memories when they wanted her to figure out what was going on?
That being said, the trolls would still be trolls. Why would they think they aren't trolls anymore? They literally have a lab dedicated to studying the blood and genealogy of trolls and it is explicitly stated that their blood is different from humans (because they are apparently Alfar) even when human blood has been mixed in. They are still different. There are 9 books here that explicitly state that the trolls are different enough from humans that they need to hide.
This trilogy ultimately diminishes the lore of the previous 2 trilogies and essentially turns it all into a story of colonisation since they stole their powers, trapped and abused the Ogonen for hundreds of years. The first 2 trilogies did NOT lead into this one and it essentially diminished the original lore and characters. I'm just going to enjoy the first 2 trilogies and I know that I won't be reading this one again.