Darc is a Deimos so he has abilities that surpass that of ordinary mortals. That said, he isn’t ready to deal with Kallavan and the Essence of Bravery. Kallavan can easily overpower just about any attack just with his sheer strength. A single punch would completely obliterate Darc with no single trace of his existence being left behind. That’s not the kind of power you can really overcome even if Darc had 1000 years of training. Kallavan wins.