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The Corrupted Cult initiated an invasion of the Saint Heaven Kingdom, which was basically declaring war against the Righteous Faction. But since it was too sudden, the churches under the Righteous Faction couldn't retaliate properly.
Due to this sudden attack, the Saint Heaven Kingdom suffered quite a lot of losses. There were countless villages that got flattened, the towns were left in ruins in their wake, and some cities were destroyed.
The forces that the Corrupted Cult had brought were pretty strong and almost unstoppable. And since the invasion was a little too sudden, the forces within the kingdom had a hard time protecting themselves.
Fortunately, the cities that were at Advance Rank and higher were strong enough to defend themselves. And since the Corrupted Cult was not focused on them, defending their land was not much of a problem.