Claws were the weapons of most beasts and animals, as were their jaws, powerful enough to give trouble to any creature even with fairly solid armor.
However, Ereg was not a beast, he was a Beastfolk and proud of it, he had claws, but right now his main weapon was something else - his energy.
In this world, only absolute power decided everything, and to a large extent, it depended on the power of a certain creature's energy. That was why there were stages such as the First or Second Chronicle and Transcendence Stage.
Ereg was one of the Progenitors and had an impressive amount of power, energy was his main weapon like any other being, so he was going to use it. Especially since he now had the power he had absorbed from Gael.