from my reading of that and my own interpretation, once you have triggered a speech thing, it won't repeat so... it'll go away on its own soon.
Things may be looking down now, but I see a light at the end of the tunnel;
Do you think I should get off the tracks?
He doesn't go away after the first time he gave the slime to me. He keeps popping up every time I do something that could trigger him. I have to click the x on his chathead to get rid of him because he keeps popping up. Make it stop!
I often don't notice he's popped up until I see the message in the chatbox. Maybe its because I play on a desktop computer and have a fairly large screen.
I have encountered this dude at three separate locations:
Near the Tree of Balance
Near the workbench on the Archaeology campus
Just inside the door to the Kharid-et fort
I only received ectoplasmic residue during the first encounter, which I believe is normal. I also understand The First Necromancer appears if you gain a skill level, and will reward you with a residue if you do not possess one already.
I've been putting out fire with gasoline!