how does death and deaths door work here

[Sorceress]

I see some of my comanions rise even when going below 0 hp
I previously played story mode and now I'm taking challenging (challenging is difficulty I tried whole last week, not hard)

[Mork]

There are 3 difficulty options for death

- Dead companions rise after combat = Even main character cannot die but party wipe is a gameover
- Death's Door = It's like a free life but need to be remove by sleeping in a real bed.
- Normal death = Spell will be needed to resurrect party member. If mc die then it's gameover.

[Doombringer]

If your hitpoints go to/below negative Constitution = dead
(so if you have 14 con and go to -14 hitpoint or lower)

Deaths Door lets you ignore the first death since sleeping in a real bed (not camping), your character's icon will have red over it if they have used their death's door.
Harder difficulty modes turn Death's Door off, so you can't ignore the first death per (non-camping) rest.
Very Easy modes make it impossible to die. (unless entire party is unconscious)