User blog comment:Xilinoc/Ch. 665 - The Princess Dissection/@comment-5693502-20160310143820/@comment-1338810-20160310163927

Based on the abilities we've seen from Benihime (and assuming Kubo wasn't just making it up as he went along until now), I would classify its power as "severing and binding". The red energy attacks have been used to either amplify its cutting power, sometimes at range, or to create constructs. So Benihime's ability seems to be to rip things apart and/or put things together, up to and including reishi and reiatsu. And Kannonbiraki Benihime Atarame has the same power, but maybe at the molecular level and on a wider scale.