For ZedTed's guide
"Cemetery Negative Energy"
Go to the graveyard on the top left of the city, talk to the keeper npc and that will bring you to the catacombs which you couldn't access before, once inside there will be a little "cutscene" with the keeper dying to a trap and leaving you alone with whatever companion you brought along. There are barricaded undeads with both archers and warriors to the right, so avoid that , instead go directly south while mindind for more traps and setting them off by throwing rocks if needed and more undeads that you should be able to easily deal with, and collect the various notes for some extra lore. Once you followed the only path south -> east -> north you will reach some stairs along with a quest mark, stepping on it will trigger a trap that as far as i know is unavoidable, it will bring you to the necromancer's lair (also disbanding whatever companions you might've had). Struggle 2-3 times to get free from your bounds and sneak past the necromancer to collect the note, he will move to the table with his "papa and mama" allowing you to sneak once again to the room to the north, which has your equipment + a note talking about the necromancer's story, read it and talk to the necromancer to befriend him. At this point groups of orcs will spawn after a cutscene, you will have to make a run for the ladder in the northern room and avoid the orcs while the skeletons keep them busy. Once outside, interact with the hole you jumped out from to seal it, go back to the tavern and talk to Big Mama who will get teary from the poor necromancer's story and give her a free permanent room where you can recruit her any time for no cost whatsoever.
Rating? I'm not sure, the quest is really easy to complete but it might be troublesome to sneak past the necromancer if you dont have enough scoutcraft. Also i haven't tested how strong he is as companion, but he can summon skeletons to fight for you so i assume he's pretty useful. The rewardsare good for how easy the quest is i'd reccomend doing it
Edit: Might add that i also found a Water Staff in the chest in the necromancer's lair iirc, i don't know if that was just RNG but it was a very welcome gift