If you loot the hags stuff in her secret lab (especially a peculiar wand named "new marriage" or something of the sort) and meet with the girl in the swamp after the hag is dead you get some options:

1: give her the wand, as it controls her dead zombie husband.
2: you become the zombies master, able to summon the zombie seemingly forever. (super bugged tho, must be cast outside of battle otherwise will not work)
3: snap the wand
4: something else
5: something else

This is one of the best quests I have ever done in an RPG. Fits 5e super well and feels very fresh. Super well written as well. I would have accepted the hags offer, but every time I got that chance the game crashed after I got the lock.

There are several peculiar potions in her secret lair at the end. What do they do? I tried throwing them at enemies since I assumed they contain something horribly bad, and should not be drunk.