The being was similar to Chaos. It was built on a foundation of many of the same ideas, since Chaos and Evil were usually associated with each other.
There was likely a good incarnation of chaos somewhere in the Void, but evil would always be evil.
And, as a true Spiritual God who was not allowed to develop the same human emotions as Chaos, Evil was not going to make any mistakes.
He charged at Claire the moment he caught her in his sights. His aura was vile, causing her mental state to tremble.
She was able to fight against it, but Evil's mind-intruding aura was passive and would continuously attack her as she fought the entity, which Claire was forced to keep in mind.
When Damien arrived in the Heavenly World, Claire was already at the peak of the Supreme God level. That was where she stood before the whole fiasco that led to her entering the lower universe, and that was where she returned to when her soul was fully healed.
