As expected of my idol, the territory that he created is indeed special as anyone in the territory is blessed by the God of Death and the Goddess of Life. I only recently learned about the god of death when I found records of the early beginnings of the Church of Life.
I wanted to sneak inside the undead citadel, but that place is heavily guarded by powerful wraiths. Even the best scout is unable to sneak inside. Also, the undead citadel is covered by a thick cloud of energy that is special to the undead. I would die before I even reach the depths of the citadel.
Anyways, it is a good thing that the demons are not barring entry to those that are of the human race. They will be allowed to enter the territory as long as they do not enter the depths of the floating island where that strange tree is located.