After Dalia was done with her mission, she got busy with trying out several combinations of material that she was unable to do when she was only an A ranker. With her newfound strength at S rank, now Dalia was able to try various new alchemical recipes that she was able to practice before. So she was extremely happy about this.
As now only Eldriana had her mission to complete, she started to put in extra effort in her battles. After just 4 days of doing that Eldriana suddenly felt enlightened and went into a meditative state. After waking up from that meditative state she found herself with her personal martial arts technique that was uniquely hers and hers alone.
Obviously Eldriana had a very good idea what her martial arts would look like. But after she was finally done creating it, she was amazed to find out that her martial arts was way more amazing than she had expected.