Monster Hunter Now 8* Diablos vs 8* Legiana Greatsword

A tough fight for greatsword. I stuck at this stage for around 1 week and decided to upgrade my ice greatsword to 8-4 and brute force this stage.
My strategy for this fight is trap diablos in the hole, and dodge the roar. Diablos will dig hole after 2 normal attack, so I wait for it and use my special to break it's tail, for the roar I use the body slam to dodge it. Hope you guys enjoy this stage and come up different way to get passed this stage as a greatsword.