So what? The player character never saw that in her mother. That doesn't change her backstory. Her backstory is still intact, word for word.
And yet she mysteriously learned arcane magic, jumped up 10 levels, studied Necromancy, and turned herself into a freaking member of the Undead in just a few years. Something that takes most non-adventuring wizards the best part of 50 years, often more. And that's starting when their brains are young - and asuming that the spells are accessible (whihc in the case of lichdom they normally aren't.)
At this point, unless she went adventuring and put herself in danger every day and was forced to draw on resources beyond herself, you've smashed most of the worldbuilding you've done. It now apparently takes three years at night school to make yourself a lich and tenth level spellcaster. At that point, all lower level threats become instantly risible.
"Sire! The goblins are invading from underneath. This young warrior leads a group who claims they can deal with the threat."
"No. They will be slaughtered. Fetch ... the slightly bored housewives."
For that matter, the entire concept of staking out "territory" is already indicative of that, IMO. Isn't gaming supposed to be a collaborative effort, after all?
Yes. And the DM is the one failing to collaborate here.
[quoet]That question sounds rather disingenious. Setting design is a collaborative effort at the personal level like this. The player can tell me what her character knows about her mom. Anything that she wouldn't know is fair game for the GM to elaborate on.[/quote]
Whenever the PC is out of the room, the mom turns into a cloud of butterflies and flutters away? What? It's something that the PC wouldn't know. And is a GM elaboration. And does less damage to the worldbuilding than turning the mother into a Lich in a few short years.
In this case, her mom turning into a lich is a natural (if extreme) evolution of the player's own concept of the mom as bitter and disillusioned about her family.
It's about as natural as claiming that she was a God who was simply slumming it as a mortal. And less extreme - it doesn't put lichdom (or godhood) in reach of a significant proportion of the world.
Clearly the PC just underestimated the depth of mom's anger.
And that she was super-intelligent, had a fixation on living forevever, and was capable of becoming a great arcane spellcaster. Her becoming a cultist and making a pact with the dark might have been plausible. A lich is not.
Which, granted, several of you who have a problem with this scenario have also said that you're not big fans of player backgrounds anyway, so at least you're consistent there.
I am a fan of player backgrounds. I'm also a fan of good worldbuilding and reasonable consequences. This is made of fail and openly turns the rules of the world into "Because the DM said so". There is no sort of consistent logic or rule to it.