I love the messages from a level 16 necro and the group of 6 level 11-17's saying they killed a SG. Good luck!
I suspect it would take a group of mid-20's with good groupwork to kill a SG, but a level 16 necro. Splat.
Oh, and they drop up to 50pp or so (and lots of cp and sp :P)
A level 45 monk