We're going to need to limit "Burrowing" in some way in order to make it an acceptable ability (even as a PL 10). I realize looking back at your last update that I shouldn't have approved that ability before either, so I"m glad this update drew it to my attention. I think saying Delath can eat materials up to mythril strength would be reasonable, that would imply that his teeth/mouth are diamond strength or greater.

Other than that your profile looks fine.