Yes, it surpasses normal immutability, otherwise, how would I be able to go against mental or spiritual type foes? They could easily dominate me and/or kill me and then take over Celadon. In addition, when I was gifted the abilities from the Elementals, they basically gave me powers that were rightfully mine, therefore, even if someone found a way to bypass my Immutability, they could not negate my abilities or my connection to the Elementals (at least not permanently); as for the B***h, I have no clue, because I've never tried it. But,srsly, let me handle her...
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)