You may use any stance

Vicious Frost and Virulent Scourge are at 1/3 to give slash proc priority

[Primed Reach] is almost mandatory in every polearm, despite the Guandao Prime having 3m of range. If you don't have Primed Reach, use [Spring-Loaded Blade] for range, or [Gladiator Might] if you feel the weapon's range is sufficient for you but want damage.

Like any endgame damage scaling builds, this also relies on your combo counter, so get Naramon's Power Spike or kill enemies successively.

Enjoy!