On the night of the siege, after killing Aylinor and consequently stopping the horde of monsters, Marcus returned to the city undetected and locked himself in the mansion to put all his things in order.
Even though the city was in a chaotic state and it was too dangerous to stay there for too long, Marcus wasn't worried about his safety or that someone might discover he was undead. Even if someone did find out, he was fully confident that he would be able to escape the city without much trouble.
After all, the number of casualties during the battle had been enormous. With almost 6000 dead and over 3000 wounded the city barely had enough people to maintain law and order. The number of magic users and aura warriors who died during the battle wasn't small either, so their numbers were significantly reduced.
In addition, of the seven most powerful people in the city two were dead, two others were seriously injured so they could not fight and one had been turned into a zombie.
