Damon did not stop with just that one display of divine radiance. He cast the three skills on repeat, claiming more and more beasts with every second, culling through the horde of beasts with ease.
While their shadow magic was ridiculously strong, they had been completely unexposed to any other kind of element, which made them very vulnerable to especially divine and holy magic. As long as Damon was able to unleash an attack power capable of one-shotting them, he was winning.
It took a bit to get over the skill cooldown and work around it. But slowly and surely, he was carving his way through the mountain of beasts jumping on him from all sides. He picked up a skill or two related to shadow healing, which further made everything so much easier.
He quickly became as robust as they were in the shadows, but he was also able to take out holy and divine magic as his weapons, giving him the slight edge.
