You unlock Mountain Splitter when you complete the Favour named Spirit of Rebellion. The official description reads: "Repeated long-range wind slices that stagger enemies. Press R1 precisely while slashing to enhance each wave."
You unlock Mountain Splitter when you complete the Favour named Spirit of Rebellion. The official description reads: "Repeated long-range wind slices that stagger enemies. Press R1 precisely while slashing to enhance each wave."