During his time in The Land of Iron and his having a natural affinity for earth release this technique was developed during a training session with a fellow Samurai.
Split massive amounts of earth apart creating a chasm below opponent’s feet and then finally depending on where the splitting ends the razor sharp chakra that had enough power to obliterate the earth below them would funnel into a crack and explode upwards at said person. Easily doing a lot of damage. It is just raw chakra nothing else for example (Rasengan)
Can be used either by placing sword into the ground or slamming it down
Razor sharp chakra flowing through the chasm funneling at the end
Changes terrain or could disable people trying to use the underground networks.
A lot of chakra needed especially if extended to a long range
To make it funnel and explode forth requires the sword to stay and chakra focus leaving open for an counter attack