So from what the Spoilers say, you need Ultra Conquerors Haki mastery to permanently damage Holy Knights? Aight, fuck it.
99,99999% of the verse have no win con against them straight up.
If you are a devil fruit merchant? You cant defeat them.
If you are a Armament or Observation specialist who has not utterly mastered conquerors in addition to your primary skill set? You also cant defeat them.
I do not wanna hear shit about ANYBODY from Blackbeard crew of fuck ups ever beating these guys not to even mention Imu ever again. No shot anybody in his crew has it bar himself and perhaps Kuzan and Shiryu even have conquerors much less some ultra advanced immortal de-buff version.
This shit Dragonball Z now and NONE of the main guys and gals are ever gonna do more than hypetool when it comes to the REAL strong guys and gals of the setting aka Imu and their immortal gang.
Usopp? Goddamn Vasco Shot? None of them are ever doing shit to a Holy Knight after this reveal.
Holy Knights not matter how much you cope otherwise via this move by Oda? Have automatically become too strong to be defeated by non-top tier, ULTRA advanced Conquerors Haki masters.
Kid and Law could find an ancient kingdom duplicator that clones them a hundred times and they still aint beating a single Holy Knight.
Also straight up, I swear to god Haki is the most awful power system in any Anime I have ever had the displeasure of witnessing. Oda is literally pulling a Super/Ultra Advanced Conquerors Haki at this stage of the story? Come on man.