With her excellent chakra control, she is able to use the store chakra within a seal on her forehead. Over the course of ten years, the chakra stored had because very vast in quantity. As to needing a new location for these vast amounts, the woman forged a second seal within her first one. This second seal was specifically used to combat the attack of mind with illusionary techniques or genjutsu. This seal protects from the most simplistic of genjutsu to the utmost complex including sound. This seal is always active when Senjō is storing chakra in her seal.