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I'm kind stuck on Riley quest line I started a quest called imp extermination where I had to do quest foe the Lakeview military to kill some imps for their claws that lead me to fighting the imp queen she join mansion but turns out I still need to turn in imp claws but I've been killing imps for a while and they haven't drop imp claws yet so I'm kinda stuck if anyone knows what I'm missing pls help me. 

hi dumb question to ask but stuck on riley questline, the request is imp extermination and need to return 5 imp claws but I've been killing imps an none have dropped imp claws. So if anyone knows what do I'd greatly appreciated.