The skinny onyx humanoid was skilled with the saber, but for the sake of tying down Azurefiend he didn't use any weapons at all. He used his bare hands, and since every part of his body was akin to a weapon he was able to tie down Azurefiend as best he could.
Whoosh. He sent his right palm out, his arm stretching to become more than ten thousand kilometers long.
Whap! Azurefiend, in his true form, struck out with his tail against the incoming black palm.
Crack! The vast black arm suddenly changed directions, lashing out in a strange whip-like manner as the arm seemed to transform into an arc that built up power and then struck out once more. The skinny onyx humanoid's entire body seemed to have transformed into a bow-like shape.