Undead Female Merchant

The Undead Female Merchant is a character and a vendor in Dark Souls. As with her male counterpart, she is near-hollow and has lost some of her sanity.

Location
Behind bars at the end of the aqueduct leading from the Undead Burg and Firelink Shrine.

Plot
The Undead Female Merchant sells items to the player, most notably Purple Moss and Purging Stones. Thus, it is useful to pay her a visit before visiting the Depths and/or Blighttown, where poison and curse are common. The Undead Female Merchant also sells poison arrows, poison throwing knives, and other oddities. She has nothing significant to add to the plot.

Strategy
If the Undead Female Merchant is attacked should she will retreat out of range, preventing the player from killing her. She will curse and taunt the player, and refuse to sell any more items. However, she can be killed if the player kills her in one hit. If the first hit doesn't kill her, using Alluring Skulls (which, ironically, she sells) can attract her back within range.

Drops
X Souls (untested).

Backstory
As with the Undead Male Merchant, the Undead Female Merchant was abused back in her homeland and claims to be glad to be out of there. She awkwardly flirts with the player in an unstable way and accuses him/her of believing that she has gone mad "like the others". Little else is mentioned or known about her.