I wouldn't recommend using a riven mod for beginners but if you're up to the challenge on getting one it's up to you. Also you may get a more powerful riven mod than what I have but it still depends on you if you want it rivened, an alternative is elemental mods but may lose some stats although still good enough.

I would recommend the amalgam version of organ shatter because it fits the combos in the Tranquil Cleave adding up an extra 60% in "Heavy Wind Up Speed".

4-6 Formas are recommended for this build depending if your using more powerful mods.

I put [Buzz Kill] and [Jagged Edge] for extra slash damage but its up to you if you want to change it but I recommend it because the [Skiajati]'s high slash damage