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This may sound strange, but such a mixed garrison of undead and dark elves could very well have existed during those events. What is happening in Ashan at this moment? Besides the civil war in the Empire, we should not forget that Railag has disappeared, and some dark elves may start acting independently. We will learn about this later when we overhear the conversation between Trals and Shadia. Moreover, Biara, in the guise of the red Isabel, is offering the dwarves help in the war against the dark elves. Secondly, the issue of the necromancers who appeared in the empire during the regency of Marcel remains unresolved. Many of them were outlawed and are trying to survive in any way they can. Remember the alliance between Giovanni and Ornella – this happens around the same time. Giovanni was lucky: his lands were located near Erathia, but the situation for other necromancers could have been much worse, especially in the northern provinces like the Duchy of the Deer.
In such an environment, one can easily imagine a local alliance between some necromancer and a dark elf against humans, and this garrison is a kind of their base. Each of them has a reason to hold a grudge against the empire... The dwarves and humans were exhausted by the recent battles, and under the cover of this, a group of necromancers and dark elves could have done something in the borderlands, where chaos and confusion reign... In my opinion, such a garrison can be considered as another possible element of the complex political mosaic of that period.