The Chaos Demon God clan suffered heavy losses, and even the Demon Emperor sustained severe injuries and had secluded himself to heal, not showing his face in the Chaos Void for many years, but this did not mean Pangu hadn't been injured.
There's a saying that one would harm eight hundred of their own to kill a thousand enemies. In situations where the cultivation strength is not vastly different, defeating an adversary requires one to pay a significant price, let alone when the Demon Emperor had the support of the three great Demon Gods and numerous Chaos Demon God minions.
After that battle, Pangu also retreated to the Primeval Continent to rest and heal, without continuing his conquests.
