Soul Wraith Puzzle

From Uopedia

This had me puzzled for all of about 5 minutes before i resorted to the typical noob ploy of

"[c Can anyone help me with the soul wraith puzzle please :)"

Of course this did attract some attention most notably from Marzeena. (Thankyou very much)

Who explained that all you need to do, is to pull the lever and kill the northern most slime and only this slime. (This was much easier when Marzeena turned up and showed me where north was. I kept killing the one that was at the furthest point up on my screen which isnt north lol) In this picture it would be the one on the right in the row of two slimes not the one below it and not the one on the left.

Next you have to pull the lever again... now this is the important bit, Just wait, dont pull the lever again dont kill anything again just wait. The soul wraith will eventually spawn and proceed to kill you without mercy or at least this was the case for me.