Ding Songyan longed for "All the World's Colors Gather," but he also feared that ability.
When he manifested the "Illuminating the Long Night Scripture" or the "Celestial Stars Scripture," even a Celestial Person standing right before him could not see through his disguise or discern his true appearance and realm unless they possessed a special technique. Yet a Five Saints Sect Disciple at the early stage of the Dayan Realm was enough to leave him nowhere to hide. At the very least, he could not conceal his strength. He had to maintain sufficient distance.
From what I've seen and heard so far, "All the World's Colors Gather" first improves appearance, figure, and bearing. This is a complete, fundamental transformation-even reaching the Celestial-Human Realm won't reverse it. Second, it can gather the colors and radiance from its surroundings, effectively adding special effects to its user.
For the martial artists nearby, it's a "strength detector." The weaker they are, the more color and radiance it draws away. Aside from Twelfth Madam's method of changing name and reality, which can falsify the result, I don't yet know of any technique that can evade it... Would a Great Grandmaster who suppressed all their distinguishing traits have their color and radiance drawn away?
These Five Saints Sect disciples can bid farewell to stealth and disguise until they become Great Grandmasters. They're like fireflies in the night, so vivid and outstanding that anyone can spot them at a glance. Only Twelfth Madam's method of changing name and reality could offer some help, but if their strength were suppressed to the Mortal Realm, they'd struggle to make use of their stealth abilities...
*Hmm, I've never fought anyone from the Five Saints Sect, so I don't know what role "All the World's Colors Gather" plays in battle. If