Actually it's Centralization remember?
New Trails raised Centralization and showed us the corruption.
Corruption isn't that simple:
Namely, just how much corruption Bynwyn had no idea was going on under his nose.
Bynwyn's Mediocre Administration mean that people could get away with corruption unnoticed, despite having higher centralization than with Twythulmyn .
Still, while Twythulmyn knew that to some extent he didn't have the skill to root out all of the corruption, there were a few people he made sure to smile extra long at who he suspected would discover a number of 'errors' in their tallies.
Twythulmyn says he
didn't have the skill to root out the corruption, which points to his Average Economy/Administration skill.
We know from the past that Stability marks when corruption becomes a problem rather than an annoyance(we also had MUCH higher Centralization at the time).
So what you need to remove corruption is:
-High Stability. Unpopular actions will need to be taken to root out the corrupt but popular leaders.
-High Legitimacy. The King must be able to push through his desires despite opposition from the ruling caste.
-High Administration. The King must be able to
identify the problem to lead to all the corrupt. More blackbirds may lower the difficulty, it's one thing to put together the clues from your reports, and another thing to have a lot of people gathering information.
-High Centralization. The King must higher personal authority than the governors below him. Higher Centralization means a bigger gamble, as the individuals targeted are also going to be powerful in turn when authority is Centralized.
So action wise, removing Corruption should be Restore Harmony + Enforce Authority as double Main on an Administrator+Warrior or Administrator+Diplomat king.
Oh and
@Academia Nut
Can you elaborate on what the new stats(Legitimacy, Prestige) reflect and are used for?