A Murphy's Ghost will never (in my experience) hit for more than 2HP of damage at a time, and tends to miss a lot. That's what makes it such a good spot for leveling-up in the early going.

The only really hard part is getting back to the Castle, as it entails your having to go through the Out Of Bounds darkness area. That's more aggravating than actually dangerous, though. Starting from the room with seven doors, enter the door at coordinates 15E, 3N (use Dumapic to get these coordinates), then go through the door to your immediate left. Follow the hallway until you come to the darkness zone. As soon as you enter darkness, turn right and walk forward exactly nine steps (you should be at 10E, 0N), then turn left and walk forward another seven steps (until you hit a wall). Once you hit the wall, turn right, take one step, turn left, take one more step, and you'll be back in familiar territory.

This thread might be quite misleading for newbies, as you judge by Wizardry 6 and your thoughs about 7 and 8 are just... your imaginings. Correct me if I am wrong.

Thanks, I'll have to go back there next time I play.

I agree the title could be misleading, and I've put a note to clarify this at the beginning of my OP. Let me know if you think it's not enough.