Board Thread:Questions and Answers/@comment-24810872-20140416125034/@comment-6053530-20140416145404

So... I could only find this piece of information that tells you about the 'field'.

From the picture taken from the official rulebook, I think it's clear that only the monster space and fighter space are considered as the 'field'. Fighter zone is an obvious no (you can't put monsters on item area, and flag and buddy monsters only act as special indicators), which leaves us the 3 monster areas.

I think that pretty much answers all your questions, though I'm not too sure if the soul counts as part of the field. It is placed on a monster area, after all.