User blog comment:CoolJazzman/Other Special War Powers?/@comment-8295743-20130428011304/@comment-6904925-20130428075150

Its just a theory, plus we don't really known that much about the Soul King himself. Oh and this is just a guess but maybe Yhwach method to get to the Palace is that he needs a Royal Guard since the Oken is in their bones, all he need to do is force to come out, try and kill one, then extract the Oken from their bones (just a theory).