You don’t get to pick your own, you are assigned one randomly, but once you finish this quest you can hire more at any time. Once you kill her when you next return to town Kashya will be eager to talk, and when you do she’ll give a speech about the death of Blood Raven, and you get a free Rogue mercenary. These will kill off any Undead in the area.

When she dies there is a fantastic bit of eye candy, with streaks of lightning pouring out of her levitating body. Blood Raven can also raise more zombies while within the graveyard. She is fond of dashing around the cemetery and stopping to shoot arrows when her pursuers get hung up on the hordes of undead. She is an archer, as befits a rogue, and very fleet of foot. The Cemetery is full of skeletons and zombies, as you’d expect, and you can kill them for experience or just go right for Blood Raven. It’s not a very large area, so you can just run around the perimeter if you don’t want to follow the paths you’ll get there eventually. You have to just follow them and see where they go, and if you pick the wrong fork backtrack and follow the path onwards. It will fork twice, one path leads to the Stony Field (where you need to go to advance through the act), another leads to The Cave dungeon level, and the other leads to the Cemetery. To reach the Cemetery you need only follow the dirt path through the Cold Plains. You must find the Burial Grounds and kill Blood Raven, an evil corrupted Rogue, to complete this quest. She can be found in the Monastery graveyard raising the Rogue’s dead as zombies. Blood Raven, one of the Rogue’s finest captains in the battle against Diablo at Tristram, has been corrupted by Andariel. Kashya’s Rogue scouts have reported an abomination in the Monastery graveyard.

Quest Priority: Not mandatory, and most characters skip it.

Reward: One free Rogue mercenary from Kashya and option to hire more of them.Location: Burial Grounds off the Cold Plains.The Rogue character from Diablo I has been corrupted by Andariel, and the player must help to end her unlife. The Sisters’ Burial Grounds are being defiled.

Diablo 2 resurrected act 3 quest 1