Spoiler: Primus
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The entire area is obviously effected by some sort of corruption, but the undead aren't behaving in a way typical to mindless undead. If they were controlled, they would be staying still or doing a specific task, while uncontrolled undead may roam, they wouldn't ignore your presence. These undead walk randomly in groups or individually... The magic that animates them seems weak, as if they only have basic motor skills and even if they were to attack you, they would not be a threat. But if the source of the animation is within the keep, quite far from here, what you encounter closer to the center might be quite different.


Spoiler: Talon
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The corruption of the area is not something unfamiliar to you. Your rebirth happened under similar circumstances. But usually Desecrate is temporary and on a smaller scale... From the tingling sensation of the energies, you know that this form of Desecrate has the shrine of the original caster in the center. Still, this magic had been here for a long time, a few centuries, and it is reaching so far...

The undead that roam the countryside seem weak and fragile, probably raised naturally and not by the hand of a necromancer. You know that such undead usually have some hunger in them, but these shamble around without purpose at all.

Perhaps a Consecrate spell will be able to cure the land, but the normal version seems quite weaker than the Desecrate effective here. Maybe cure patches of the land, but within the walls, you have doubts about its effectiveness. Destroying the shrine might help, but that would surely attract the attention of the deity, too.