a zombie handmaiden  

Just some quick advice, if you don't get the update after killing the first one, simply yell for help and run until the other one stops chasing. Then return and they'll both be up again, it makes things go a lot faster. G'luck.

Lack, Hunter of Fairies

Yes, I'm quite proud of that title...

To get to the zombie handmaidens go South from the atrium, once you hit water go left up the stairs, follow tunnel until you come to do door, take right when you enter the room. They should be right there in that pit. Not sure if there are any others in the zone, but these were the only ones I found. I got quest update for A Key to the Past after first kill.