I just finished camping Raster here's what I've learned. As mentioned, his PH despawns shortly after 8AM game time, and respawns shortly after 9AM. This is handy for a quick respawn only as the normal spawn time for his PH or Raster is about 30 minutes. I did it, but don't believe it had anything to do with his spawning, because he spawned at about 10PM actually.
He spawns on the ledge up the steps near that flower pot(or whatever it is) I suspected that's where he spawned after looking at the picture and seeing a piece of it on the left side of the picture. My hunch was correct.
BTW the elder spawns in the pit below. I saw him twice in the time I was camping Raster.
I guess I was lucky after reading all the horror stories I was ready for a long long camp, it took me three hours.
Sslythr
51 Iksar Monk
Lanys T'Vyl