Hello, just to let you know I'm not a professional, just a writer like you.
Overall sense
It started slow, but drew me in and it kept me reading until the very end. Left me with a feeling of wanting to know more about his adventures. Your plot is off to a great start and both Alvar and Adamant are strong characters, and can be pictured easily while I read.
Grammar/spelling
I spotted one time you put mum instead of mom. "“Yes mum.”
Areas of improvement
I would reword him being special into showing him as special. "He was considered special by the villagers. " what did the villagers see that made him special. Maybe a little more about this would help bring him to live sooner in the story.
Favorite line
Adamant backed off. He was rendered speechless by the boy’s courage.
I really did enjoy reading this and hope to read more of your work on this story line. Great beginning to any adventure fantasy story. If you write more with this beginning, please let me know, I would love to read more. Thank you for writing and posting this for me to read and review. Mystic Angel