eris404
Explorer
hmmm...do the other players seem bored with game or annoyed with the half-dragon character? Because a lot of what you do depends on that.
Having said that, you could create a powerful dragon who is offended by half-dragons to the point of wanting to destroy all of them - they are abominations and a weakening of its proud race. The dragon travels in disguise, perhaps changing his appearance often, and never reveals its true form. It's been watching the half-dragon and believes him to be a threat that must be rubbed out. Perhaps it uses dominated humans and other creatures armed with weapons attuned to this character's dragon type. Perhaps these weapons are temporary (such as an oil or an arrow that might break) or the dragon is immune to them for some reason. Regardless, none of them know their master is a dragon and being dominated, would not think to hurt it. It sends wave after wave of minions after him, all of them seeking to kill the half-dragon to the point of ignoring the rest of the party. Perhaps they have an insane look to them and scream "abomination!" when they see the half-dragon. Eventually, the dragon will realize that if it wants something done properly, it will have to do it itself.
Do I think this is a great idea? Not really. Unless done well, I think it would be obvious that the intent is to kill this character. It's probably better to go with what the other posters said and just confront the player.
Having said that, you could create a powerful dragon who is offended by half-dragons to the point of wanting to destroy all of them - they are abominations and a weakening of its proud race. The dragon travels in disguise, perhaps changing his appearance often, and never reveals its true form. It's been watching the half-dragon and believes him to be a threat that must be rubbed out. Perhaps it uses dominated humans and other creatures armed with weapons attuned to this character's dragon type. Perhaps these weapons are temporary (such as an oil or an arrow that might break) or the dragon is immune to them for some reason. Regardless, none of them know their master is a dragon and being dominated, would not think to hurt it. It sends wave after wave of minions after him, all of them seeking to kill the half-dragon to the point of ignoring the rest of the party. Perhaps they have an insane look to them and scream "abomination!" when they see the half-dragon. Eventually, the dragon will realize that if it wants something done properly, it will have to do it itself.
Do I think this is a great idea? Not really. Unless done well, I think it would be obvious that the intent is to kill this character. It's probably better to go with what the other posters said and just confront the player.