Black weapon users are born with incredibly powerful spirits and willpower, which they channel into their weapons. By utilizing armament haki, their weapons become darkened over time until they turn pitch black.
Sharpened Spirit
Beginning when you choose this style at 3rd Level, your weapon attacks score a critical hit on a roll of 19 or 20.
Haki Weapon
At 7th level, you may unlock any one "Uncommon" Color of Armament Haki Advancement. If you have already taken all the uncommon armament haki feats, you may take an uncommon haki advancement feat under a different color of haki, assuming you meet the prerequisites.
Improved Style
At 10th level, you can choose a second option from the Fighting Style class feature.
Superior Sharpened Spirit
Starting at 15th level, your weapon attacks score a critical hit on a roll of 18-20.
Haki Weapon Master
At 18th level, you may unlock any one "Very Rare" or lower Color of Armament Haki Advancement. If you have already taken all the very rare and lower armament haki feats, you may take a very rare or lower haki advancement feat under a different color of haki, assuming you meet the prerequisites.