Sharog and the others had been anxiously awaiting the appearance of these zombies. Though the news had been shocking, the date of the prophecy gave them plenty of time to mentally prepare.
Of course, they did more than mentally prepare, their physical preparation was not half bad either. The main reason was that Prild continued to receive prophecies that more or less accurately pinpointed the location from which the zombies would emerge. Without an accurate location, it would have been impossible to ambush the zombies as they appeared.
Thus, knowing the location they set up some various traps and weapons. With Sharog's knowledge from Vorgarag still fresh in her mind, she made elemental cannons. The traps they set up were a mix of arrays and manually triggered devices.