no it will. Blades even without arnament can hurt luffy .
Luffy goes to attack him but Porchemy gets tired by this kid, extends the cutlass to chop the arm of Luffy. Kaen seeing this uses Soru and counters with his own sword, blocking the strike. Porchemy gets surprised as he tries another time but this time Kaen goes on the offensive.
Anime & Comics · Renji_Uchiha
It can be trained by upgrading your own haki
Abilities: C-Level Kenbunshoku Haki(Observation), C-Level Busoshoku Haki(Arnament), C-Level Haoshoku Haki(Conqueror's Haki), B-Level Cooking, B-Level Swordsmanship, C-Level Rokushiki/Soru.
Black Dragon Admiral of Marines
Anime & Comics · Renji_Uchiha