This mob doesn't respond to hails and rejects quest turn-ins. I spawned him by getting the book from Drakkis (who also didn't respond to hails or have any text he said back) and turning it right back into him. The specific quest that didn't work last night was the necromancer test of heart. Again, in this case the items were spit back out to me and nothing was said by Dugaas. I've attached a screenshot to prove the items I was handing in are correct and in my inventory.
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