The way this Build works is that you'll buff with Golden Vow and you'll use Bloodflame Blade to help set Hemorrhage on most regular enemies, as it adds to the native bleeding of the Cross-Naginata or Nagakiba. You'll then use Phantom Slash if you're using Cross-Naginata or Sword Dance or Double Slash if you're using Nagakiba.

Phantom Slash applies Bloodflame Blade if you're buffed with it to its attacks, and what's great is that it will connect even if you get staggered during your own attack animation, allowing you to stagger enemies in many cases, and allowing you to recover and attack. You'll have to choose your openings a bit more carefully when using Sword Dance or Double Slash, but Sword Dance still has fantastic range.

Black Flame Blade is used on more difficult enemies, and since you have high Faith the damage it adds to your attacks is substantial, and this is in addition to the Black Flame damage over time it places on the enemy.

Black Flame is great for range when you need it, and Scouring Black Flame is a good AoE that can hit multiple enemies and is good at mid range when enemies are aggressive, and Black Flame might miss. Black Flame Ritual is fantastic against aggressive or large enemies and it hits like a truck. I like to charge it for a larger radius, making it hit more effectively and increasing its damage due to Godfrey Icon. Black Flame's Protection stacks with Golden Vow and will make you very very hard to kill.