A religious body succeeds, not merely attempts but succeeds, in confronting and removing corruption that has crept into its own practice, ideals that were once genuinely spiritual having hardened into something material and self-serving. Success is the specific claim the degree makes, and that claim matters: reform of this kind does not happen automatically or gently, it has to be pursued and won.
The decisive, sometimes forceful energy classically assigned to this final decan is exactly what such reform actually requires; corrupted practice does not correct itself. Pisces, the sign most associated with dissolution, here dissolves not a boundary between people but the corrupting buildup an institution has allowed around its own original purpose, a necessary and painful cleansing rather than a comfortable one.
Its weaker form is purging that becomes its own kind of corruption, reform pursued with such force that it destroys, along with the genuine rot, whatever fragile good the institution had actually managed to retain. Nothing in the image specifies how the corruption first took hold, only that it did and that the institution found, within itself, the will to name and remove it rather than simply outlast the scandal.