"--ac! Isaac!"
"!!!"
Before him was a tower of flames from the wound that Isaac cut into Onyx's body. The tower of flames reached high up into the air, exploding with high temperature.
Onyx was standing before Isaac, his body armor behind him, melting from the high temperature. Isaac looked up and saw the Lion beastman looking down on him with a severe expression mixed with disbelief.
There was no deep wound on Onyx's body. Isaac's sword could not penetrate Onyx's body even with his most powerful strike.
Across his chest was a parallel line engulfed in flames. From his left shoulder to his right waist, "I did not use mana or even attempted to block your sword. I can make excuses, but, the fact of the matter is that even with your low level, you cut my armor. I don't know what you did, but I commend you. Be proud, young human."
Onyx lifted his right foot to stomp on Isaac.
"AH!"
Fun Fact
Durandal is pure steel, there are no hallow spaces inside, but how it has pathways remains a mystery.