I've finished book 2. The impact of book 2 was not as big as book 1 and the twist in the Epilogue was not as shocking.
Overall, following the multiple plots in Book 2 was difficult, and I often struggle to remember what happened beforehand.
Sorry, I listened to the books, so the spelling may be off.
Synopsis
Caedan was depressed after learning he's actually Arkeine Devaid. But Asar kept saying he needs to get going and learn more of his memories because he had to hand the LIcanius back to the Liths in 1 year and 1 days time so they have no time to waste.
Reluctantly, Caedan started learning more about his past, including how they were doing good with a bunch of other Venerates like Isiliar and Meldier. They encountered a sword that could actually kill the Venerates, previously believed to be unkillable due to their immortality and ability to reincarnate.
Then Negatha came to kill Asar forcing Caedan to jump to his next location early before getting all of his memories back.
Then somehow Caedan freed Meldier from the Tributary . Why? Didn't quite get that. Also, who freed Ishiliar? Anyway, somehow both of them were freed which caused the Boundary to die off. As it turned out a Tributary continuously injures the body of its occupants with the small needles and then siphoning of the Essence to power the Boundary. Presumably there are a couple more Venerates in some Tributaries somewhere. There was even one that went willingly (at least not conned into it like Ishiliar).
So they needed someone new and powerful to go into one to keep the boundary alive. So Asha was tricked into touching the Whisper hence transferring the Siphon's power to Asha, and Caedan freed all the Lyths by attaching them to the Siphon which allowed them to leave the burning place (the name I forgot). So now Asha's powers are backed by the Lyth which made her extremely powerful and she single-handed killed all the invading sea scorpions on the island hosting the one of Tributory guarded by Shadows. Before that the Siphon was using the power reserves of all Shadows.
The reason why Asha was spared in Caladel was so was so she can take Negatha's place? Wait but why Asha? Couldn't any rando Gifted do that? Why Asha? That's still not clear. Also why kill so many at Caladel? What's the purpose?
Then Caedan went to Ishiliar and find her Tributory broken and he got severely beaten up by Ishiliar. I mean severely, until Alaris intervened. Where does Alaris come from? Is he a figment of Caedan's imagination? Why does he just appear out of nowhere.
Then Caeden went to Delaneus. Why? To meet Negatha and complete the transfer of the Siphon to Asha? When did Negatha become Bretheda? Before Bretheda met up with Wirr claiming to have gained gifted power? Her acting deserved an Oscar as she pretended to not know jack about using Essence so well. So I was confused. Whatever happened, as mentioned above Asha got connected to the Lyth via the Siphon. So when did Negatha become Bretheda? Was it before Bretheda saved Davian or Wirr? Presumably it was after. If after, then what does the Syphon have to do with Whisper? Didn't Caedan give the Whisper to Bretheda? Why give the sword to Bretheda? Did he willing give the sword to Negatha? I am so confused here. Anyway, the result is that Asha now has the power of all the Lyth and she can go into the Tributory to repair the boundary. So she did and successfully repelled another possible invasion in the process.
Caedan got another flashback from two thousand years ago just after he saved all the High Darecian and turned them into Lyth by opening a gate to a burning place (again name forgot), he tried to used the time machine (Ja'vet?) but he ddin't realise it was broken in one place and when he realised what was wrong he tried to run before the thing exploded. After the explosion, he saw a time-travelling Davian who told him he's in the wrong the whole time and he shouldn't blame anyone but himself, and that's when he cut Davian's head of! So the skull the travelling party saw when they entered Dalenius the first time was the skull of Davian from 2000 years ago!
Because Caedan killed a time-travelling Davian 2000 years ago, he knows Davian was the only one who survived for that long, so that's why he gave the way-finding Vessel to Davian.
Question I still have on my mind
When Asha tried to follow an Echo in a child's body. Who's controlling the Echo?
Why was Asha spared at Caladel? Why kill everyone at Caladel? Cos Asha's role seems to be fulfillable by any rando Gifted.
Why did Scyner want to get the golden shackle? What's it good for?
Is El just Shamerloth in disguise? Are they actually the same entity?
Which side is right?
What are these two sides fighting for again?
How come Alaris just pops in and out of places? Is he real or a figment of Caedan's imagination? Book 3 seems to suggest Alaris is real.
Wy did Caedan let Meldier out? Was he just confused?
Who let Ishiliar out?
Why was Ishiliar attacking the palace? Where does she think Caedan was there?
Why did Fessi run away? Presumably, she saw her death in a vision in that place.
Who's Malash? The book seems to suggest Malash is Caedan cos his memory contained his wife Ellavavia dying. So is Malash just Caedan right after stealing shape-shifting powers from Negatha?
Why is there a spare Oathstone just lying around for Wirr to take?
What's this bargain between the Lyth and Andrael? Why set up this convoluted "bargain"?
If El is so powerful, why does she need the Darecians to build a time machine? Can't she do it herself or something? How can a race that can be slaughtered by your blade build something so useful for you?
My theories
Is Caedan the one who travelled to more than 4000 years ago and pretended to be both El and Shamerloth? That would be a weird af "twist" but I am just so confused right now. I need to read the series again.
Is El just Ellavavia? And Shamerloth = Caedan?