My two cents on this, Bonesword's sole powers are he can create and control plants, he can infuse his blade with Holy Energy to beat Demons, and he's a good swordsman. I think that it's somewhat unfair to deprive Bonesword of the first power when Ban found an interesting and creative counter to a character that is obviously way more powerful than all of us. Not even a full counter, just neutralizing effects in a small radius even.