I picked up this book and the sequel a long time ago because I absolutely loved East. This was definitely disappointing in comparison. (I'm still going to read the sequel because I hear it's better, but let's just say things improved between 1991 and 2003).
This book is definitely aimed at kids, and there's really not much there for adults. It reads like an outline that was filled in hastily and then never edited. Even kids probably wouldn't like it unless they've never read a quest story before (anyone over the age of 3 could tell that the dialogue in this book is ridiculous). It's also too much like a game. It's got a very formulaic RPG kind of progression: protagonist leaves to look for the missing person; party members join one by one; there's a convenient macguffin; there's a GNPC who appears every once in a while to save the characters from a difficult encounter (and/or drop some exposition) and then disappears again; encounters happen one by one; and then there's a boss fight at the end.
The writing itself is just full of rookie mistakes. These things constantly pull you out of the story and make you wonder what the editors were on and where you can get some.
-Introducing too many new words that aren't even relevant (just because it's a fantasy setting doesn't mean we need a new word for every other noun, especially when it's a word you only use once and then define it and it's never used again.) I like fantasy names and languages but this was just too heavy-handed. It didn't feel like immersion into the world, it felt like the author was barging in and saying "LOOK AT THIS FANTASY WORLD. SEE HOW FANTASY IT IS? IT'S SO FANTASY THERE ARE EXTRA WORDS EVERYWHERE."
-Random lapses into pseudo-omniscient POV when it was supposed to be limited to the main character's perspective. "Collun could tell that Brie was angry about [thing]", "Collun sensed that Talisen [was thinking something very specific]", etc. Sometimes this happened even after the character in question said something or used body language or gestures that would have told the reader what they were thinking anyway. Why does the main character have mind-reading powers all of a sudden? It's not that hard to delete a sentence when you realize it doesn't make sense with the POV of the book, especially when it's just telling something that you've already shown!
-The dialogue had a lot of problems. Characters would talk in sentences that sounded written instead of spoken, and include definitions of words like the kind you see in a textbook ("the [new word]-- or [definition]-- is over there"; "it's a [noun], a [definition]", that kind of thing. People just don't talk like that.) Characters would also talk in paragraphs of narration. Just because it's first person and in quotation marks doesn't make it dialogue. When you're telling someone what happened to you in the recent past, who you've been fighting, etc., you don't use long, structured sentences and include adverbs. That's not dialogue.
-The characters weren't believable. Silien was supposed to be chaotic, unpredictable, only looking out for himself, and not sharing priorities with the humans... but he was written just like anyone else, and only Brie's suspicions and some of his own dialogue said "this character is chaotic neutral and unpredictable!" but I still didn't believe it because he wasn't written that way at all. He was written with the same personality as everyone else. Collun never developed a consistent personality. At the end (and at the very beginning), the cowardly farmer kid suddenly started acting like a typical young, rash, wannabe "hero" who refuses to get help from his friends for absolutely no reason. It was supposed to add drama but it was just confusing.
There was an awkwardly forced love triangle which got magically resolved because Collun's competitor for The One And Only Girl In The Main Plot gets injured and starts hating everyone for some reason.
Also (spoilers ahead): finding out that your dad isn't your real dad doesn't mean you can't still be friends with him! This guy lost 3 people at once (a good friend and two people he'd known since they were babies) and you're not even going to visit him because "oh, we're not blood relatives? Then I don't care about him anymore" with a side of "he's no fun to be around because he's depressed". What? You don't have to be father and son but you can still be FRIENDS, especially since he suddenly lost 3 people he's been LIVING WITH FOR YEARS and he was ALREADY DEPRESSED before they left/died! (And what about Nessa? Nessa was better friends with Goban than Collun was, and even she doesn't want to visit him! He was clearly written just to be pitied, and then the characters and plot just throw him away because he's not part of the formula after the first couple chapters.)
I'm not going to go through everything, but a lot of events in the plot stick out as just... off. The labyrinth could have been a neat dungeon crawl full of suspense, encounters, traps, riddles, and other fun stuff, but instead they get untied easily by the party faol (some kind of mammal with sharp teeth) who was stuck in the dungeon with them but not tied up for some reason. No suspense there. Then they go into the labyrinth, remember one clue, make a wild guess and then extrapolate wildly with no logic to it, and then their one and only guess turns out to be right. The riddle isn't something the readers can follow along with because it's just wild guessing about which pictures on the walls point to the way out (and the readers aren't even told that there are different types of leaves on the walls, or given any way to guess the answer, because it wasn't a riddle you could figure out, it was just a guess). They don't get lost, they don't misinterpret the clues, they don't encounter any creatures or trapdoors or booby traps or anything. They just get out. Then any time they get into trouble, someone swoops in to save them before they even have the chance to try it themselves. There's no suspense, no growth, and no chance for the reader to feel anything for the characters or to follow along while they figure out what to do. When he's learning to ride the Ellyl horse, he makes a big deal of mounting by himself for the first time AFTER he's already been on the horse with no other humanoids around. New information is introduced via infodumps at the last minute right when the characters need it, when it should have been introduced earlier so that the readers could actually engage with the plot.
Look, there's nothing wrong with writing a formulaic quest story for kids (or adults) if you do it well. I'm just not sure how this book got through the editing process and remained so completely unedited.
Side note: I really wish we'd spent more time with Talisen. His plotline was actually interesting, and it had a lot of potential. A young bard who can't make his own songs yet searching for stories, spending some time with the Ellyl, learning their songs and how their magic works, only to find that he can't remember them when he goes back aboveground but he can write his own songs now and then finally writing a song about the quest? That story has so much emotional potential but we didn't see any of it. He was just the overenthusiastic sidekick. There were no emotions anywhere in this book, even when it was attempted, and for Talisen there wasn't even an attempt. I found myself having to imagine my own tone for most of the book (trying to imagine it as a movie with a dramatic soundtrack and constantly editing the dialogue in my head, all things that the author is supposed to do for you when converting the story from an outline/draft to a book), but it was most disappointing with Talisen. This is called the Hero's Song / the Songs of Eirren; this should have been way more important than it was. We should have gotten to hear some of the words to his song at the end, or at least descriptions of what it sounded like, what it talked about, and how it made the other characters feel.