It seemed that the fall of the Midnight Crystal was a gift of fate for the monsters living near the Fume Cathedral.
The monsters and the Citadel had yet to figure out why Midnight Crystal had decided to fall here at this moment because it wasn't Midnight Zone, so there had to be some serious and specific reason for it.
Midnight Crystal couldn't have fallen in a random place just due to luck, because no Midnight Crystal had ever fallen near the Citadel or in the newbie areas. Midnight Crystals could only fall in Midnight Zones, not because it was some magical place, but because the conditions were right for it.
It wasn't Midnight Zones that attracted Midnight Crystals, it was the conditions that caused Midnight Crystals to appear in certain places.
This was also the reason why there were no Midnight Zones in Blue Threat Level areas. Midnight Zones started appearing beginning from Purple Threat Level areas.