I started my camping on a saturday at 1pm EST. Break from Sun 10am to Sun Mid. Got GBS at 4pm Monday. 4th of July weekend. Figured only chance I would ever have.
It took killing her 6 times to get my GBS. 37 hrs of camping.
I noticed the following things:
1) Tovax preceded her spawn 5 of the 6 times. Kill him.
2) She spawns all over the place, but always tries to come to the ruins, center column area.
3) I killed every thing in site, ruins was empty when she showed up the last time.
4) I believe the skellies are place holders. Would have dreads, putrids and regulars walk up and sit in the spots where the decaying skellies go to form the ring. Tovax made his way to ruins about 1/3rd of time - may have more if I didn't go hunt him down.
5) Spawn time on Pyzjn is random, had two in one night, didn't see another for 10hrs.
6) High Level Bastards will try to kill steal you (had 3 try) usually go away after 1 night.
7) Being necro had to use sense dead as my tracking, not great but was effective. points you towards nearest undead (incl. corpses, other ppl pets, npc pets, misc skellies which you want to kill anyways)
8) The area around the ruins seemed riddled with despawn locations.
9) She mopped my lvl 16 ranger in banded. Feared me and proceeded to wail.
10) When I got the GBS, I looted before the pet was dead. Surely has no bearing but if you camp this spot paranoia and superstition is likely to set in.
11) Did not hear of or see varsoon once while camping. Got a hunch the GBS and him are related in a necro quest.
Tips to pass the time:
Help lowbies level at ruins, give out rib bones to monks, fletching is a fine skill.
Last note earliest kill GT: 8pm
latest kill GT: 4am
Hope it helps.
If you have not seen a GBS, it looks like you are wearing a blinking red ring, kinda like the green lantern enemies.
Zul - Master of all he surveys
Shakazul 26 Nec - Mith Marr