Element/Zero [Book 1]

Philip Mrown, an aspiring hero, saw his best friend, along with thousands of others, get destroyed in front of him, in an incident involving dark energy. Investigating the incident, he discovers that it was caused by one of the three Eyre stones, objects of great power that, when put together, can fulfil any wish.
Philip deduces that a war will break out over these stones, and decides to take part in order to prevent anyone from making a wish with evil intentions, but what does he really want?