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Using Constantines Sword, you can kill the ghosts and phantoms that patrol the later stages of the game.
It is best to get up behind them with the sword raised over head and then strike as this seems to only take t blows as opposed to the standard left or right strike which may take 5 or 6.
At any rate, try not to let them cast a spell while you are trying to kill them.
If you keep hitting them then they disappear into a puff of smoke.