One, they can't effect omnipotence weilders with a higher or equal ^ to their own, and they can't escape The Box. True omnipotence means that one has no limits, only bound by fiction, but there are some things that surpass fiction to a certain point, and even entirely, as shown in the paragraph below levels of omnipotence. Certain characters aren't listed here, for the simple fact that their subcategory isn't available on this page. They're still well within the hierarchy.