I like this, I like where it is going and I think it has a lot of potential. In this small body of text you have outlined a story that could fill a book, and a book I would read! However that is the main point of my criticism, all these events and thoughts an feeling on have a couple of sentences each at most! This, to me, is more an abstract then a chapter or excerpt; there is too much great stuff in this to just pass each off with a sentence. In this block of text you have outlined the past story of a character so that the character may be better understood? (Forgive me if I'm wrong). The best way to get this character better understood is to actually write the story that is outlines, with a healthy amount of embellishment and writing through each event each sentence here could fill a chapter or two. That would make a really good book.
The other point I would make is that this is a really good 'recap', it would be a brilliant thing to start off a second novel with. However I appreciate this is only a excerpt, and therefore all my comment may lack the necessary context and therefore be redundant.
I think this character, Rendell, has a huge amount of potential as a fantasy protagonist, however his background and history is far to involved for him to be fully understood from this excerpt alone; we only get a very brief glance at who he is, who he was meant to be and what he will become, personally I would like more.
I hope what I've said is helpful and encouraging, please keep writing!