Halgvar is a badly wounded soldier of the black watch. He dies after this dialogue but his soul shall be honored by his brothers! 

His dialogue:

Hey, you there! stop!
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It does not matter anymore. I don't have much time left. You came through that portal, So I am assuming that you can handle yourself well.
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I'm glad you are alive. Listen, my guess is you are planning on entering the city.
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I don't think the Black Watch can even answer that.
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Yes, it is the name of my faction. We are mercenaries of the sea. Not from around here, but that does not matter now.
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I can't say for sure. My friends went mad, turned on each other, I managed to fend them off but I fear my life was the price.
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Yes. Some soldiers started having hallucinations, undead started rising from the ground and some necromancer cult attacked us out of nowhere.
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Once you get to the city please get to the Star of the North fort. Our remaining force is held up there and they need help.
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Thank you stranger... Go now, I'll just rest for a bit... Need to close my eyes for a moment...