Between the Dusk and the Dawn (слэш)

When Arthur is sixteen his father deems him ready to lead the knights on his first mission, which is to take care of a druid camp that has sprung up within the borders of Camelot. In the midst of chaos and bloodshed that leaves Arthur guilt-ridden, he manages to save one boy whom he swears to protect at any cost.
Over the years Merlin becomes so much more than Arthur's redemption, but is Arthur ready to accept their shared destiny, his own feelings for the younger boy and the chance for love Merlin is offering him?
(underage tag for Merlin being 16 - Arthur is 21)