User blog comment:EmrysOfAlbion/Arthur's Bane Theories/@comment-4650675-20120926140757

Arthur's bane stalks...like a ghost. So my theories are: There it is, my top choices!
 * Merlin, for the obvious reasons. He is Arthur's shadow, and maybe he is too overprotective of him, so when Arthur will have to do something on his own, he'll fail.
 * Morgana. She wants to kill Arthur since season 3, so she kinda "stalks him like a ghost".
 * Uther's influence maybe
 * His magic hating attitude(at least so far).