Artificial Spirit Souls are mostly rigid and not adept at combat. But his Dark Gold Skeleton King was exceptionally formidable in battle. It was precisely for this reason that he was able to hold his own in the fight and competition against Tang Yuge, even displaying an ability to match her. It's worth noting that he hadn't yet broken through to six rings. Once he reached six rings, his strength would undoubtedly be much greater. Therefore, his Martial Soul was no longer the original Golden Skeleton King, but this far more terrifying Dark Gold Skeleton King.
The Great Five Elements Divine Light from Tang Yuge didn't have a significant effect on him. Despite a fierce battle and ultimately winning by exhausting Sima Xian's Soul Power, she was never able to breach Sima Xian's defense.