I am looking for a book I found in the library about 6 years ago. It was in tatters then, and the librarians didn't know it existed so I'm assuming it was pretty old.
It's high fantasy, and revolves around a (farm?) boy who is found to have some kind of powers (telekinesis / pyrokinesis as I remember.) He is found to have these abilities by the authorities, and goes to a place where people with the abilities are trained. There he meets his mentor (an elserly man) and his companion (in the shape of a horse, as all of them are), who he speaks telepathically to, and whom he loves dearly (souls bonded type of thing, each special person has one.)
The boy is non-violent (and not a soldier), but when a war breaks out all of the people trained like he is are required to go fight. He tries to negotiate peace (as I remember, this bit is a bit foggy) and doesn't want to harm his enemies, but they kill his companion. Driven mad by grief, he sits atop a hill and kills them all via pyrokinesis, taking great pleasure in watching them burn (this is said to be like ants under a magnifying glass, as I remember. Might just be how I saw it.) Using his powers so much kills him, leaving him drained of all life.
Unfortunately, this is all I can remember (which is why I'm having great difficulty finding it.) The library moved buildings, and had a lot of old books tossed out (don't even get me started.) They rebuilt the book listings after that, so I can't even look through their records (and the book is no longer there - both fantasy/scifi sections are small.) Hopefully someone else has read it...
The copy I had was around 300 pages, and had a green cover depicting a woodland forest theme.
Feel free to ask for more detail, but I doubt I'll know it.