Ok Gylton also spawned by highsun at loc +2687, +1357, -312. So he appears to have multiple spawn points, but roughly in the same area, north and west of the giant fort.
I've been killing all sarnaks and greater skeletons, mouldering gorillas + whatever else I come across.
[i][sm]Edited, Jan
Update .. the checklist I was using said I needed Nez, Phurziken AND Gylton. Scrap that .. you only need one of these bloody things. I should have r ...