Judging from how the Necromancer Association behave during these past few months the necromancers could summon a large amount of undeads even if its just a 100 of them.
Also they are expert in using curse magic weakening their enemy.
The more people die the greater the number of undeads they could control and the stronger they get.
Even though their group weren't scared with this typee of abilities they have since they had Sans but as long as the Necromancer Association mobilised their peak expert then the number of high ranking and powerful undeads that could pose a problem to the army.
'It seems that the impending battle wouldn't be as easy as I thought' Elsa thought.
As Elsa arrives at where Yshelia was working in she saw that Yshelia is working very hard and she was very focus on her work to the point she ignores everything around her.
