Let me explain the precursors,
The Libris Mortis handbook does mention that when a PM picks up Deathless Mastery, their body becomes partially mummified. I don't believe it's a fair trade to miss out on all of the mechanical benefits PnP offers just to get tied down to a PnP example/explanation (disease, poison, sleep effects immunity, etc... in exchange for having to RP the mummified bit during interactions).
I think brushing off Deathless Mastery as a supernatural ability would be acceptable because there are more undead to draw inspiration from than the textbook example about mummification, but let's not go there...
With that said, the player still has a responsibility to make sense about why their PM become crit immune.
So then, specifically concerning my own PM Alrune, I'm proposing I change gears with her a little bit. She's keeping her personality, but she's a growing girl, her body is changing, and she's going to be going down a little bit of a descent.
- First, she's no longer going to experience natural regeneration. Magical regeneration still makes sense, but she's gonna have to manually bandage and stitch herself back up. She was a studied physician (max heal skill + physician job) so she knows how to do that and is well practiced. This means she'll almost always be visibly bandaged up and stitched.
Idk if a DM could, but I want to turn her health regeneration off when she rests to better represent that. Be that implemented with a widget or code or whatever, I don't really know that kinda stuff. But I'd like it implemented if possible, because I know I'll get lazy/forget and inevitably walk away with the rest healing - Second, she's gonna get pale. As her near-sleepless nights take their toll on her, her skin color is going to pale. This will go hand-in-hand with the first bit since her natural regeneration is stinted. I want to continue to explain that as nearly non-existent blood flow. With that comes poor nutrition delivery and constantly low oxygen.
- Third, she's almost always going to project a faint stench of death. Between her profession (working with dead things constantly) and her natural regeneration being stripped, NPCs and Player Characters can pick up that aroma if you're really close or have a spectacular sense of smell. Otherwise, she smells of softly floral soap and *body* spray, but is regardlessly still going to look like an accent-prone perpetually-exhausted pigeon.
Some things to note:
Because of the extent of her gradual descent, I want to make sure this is alright with the DM team and see if my homies think this is a cool idea too
Thoughts?