After hearing Vincent's question, William smiled and said, "Don't worry. Even a Moon Realm invasion has to follow the basic rules. At this stage, other than summoning some Lunar Monsters scattered among the worshipers to create panic, they temporarily can't let legion-sized Lunar Monsters descend into Currere. We still have plenty of time to prepare for the invasion."
The Moon Realm's large-scale invasion was similar to a tidal wave. There was a process of accumulation.
After all, a legion-sized Lunar Monster couldn't be anchored by signing contracts.
The Void Sovereigns needed to indirectly influence Currere to create an atmosphere that allowed the Lunar Monsters to 'breathe.' Only then could they maintain the existence of the Lunar Monsters in Currere for significant periods.