"Lost in the bogs" Topic

Our valiant witchers have tracked the undead to the depths of a sinister swamp, where their are ambushed by The Undying and his hosts

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Give that man a medal (or at least a gold piece or two).

"the undead menace is vanquished from Reikland!"

I'm no scholar, but is that correct?

Vanquished is past tense, utterly destroyed.

'he is destroyed from your house'?

Maybe exorcised?

And

Vanquished is past tense. Is is present tense.

"the undead menace was vanquished from Reikland!"

Better, but they are still being destroyed from a place, which makes no sense to me.

"the undead menace was exorcised from Reikland!"

Sounds better to me.