A darkwraith will jump down from in front and to the left, kill it. Then turn around and jump down from where you can summon Beatrice (towards the area with the drakes). Now run through and turn right around the corner for another dark wraith, kill it. Bait the dark wraith on the right side of the pillars inside to come out, kill it, then kill the second dark wraith who is inside on the left.
Wait for the 2-3 ghosts on the left of the entrance to come and kill them. Now go back up, and go up the stairs that you skipped before, but don't enter yet. Now go left of the stairs in front of you where you find a set of downstairs and take out the dark wraith there. Darkwraith farm route (best by far): From Firelink bonfire run to the New Londo bridge, pop the curse item to kill the two ghosts, jump down to the area with a little bit of water and kill the 1 wraith, on the right is an illusionary wall with another behind it, lure it over the bridge to you so it doesn't fall off after dying.
