Pov Hela:
As soon as I entered the barrier it wasn't difficult to kill everyone, that's because they were almost all mages with few Warriors.
There is a reason why I used a Deadly Tree and Demonic Corpse Beasts, the trees are as strong as weapons and attack any living thing relentlessly from all sides except me while the Half Rotten Beasts also like to attack any living thing, but these Undead have the characteristic of spreading their odor around causing various abnormal effects such as necrotic poison, confusion and some types of diseases.
As soon as I went through their illusion I saw the few Warriors trying to fight the 3 trees and without the time to fight the much weaker Rotten Beasts, but these monsters don't need to be strong, they can spread the abnormal effects even dead while their bodies don't are burned, moreover, they are numerous and do not know fear, they will continue to attack until no one suffers.