Re: a couple of questions about regeneration:
 

If you are (LA only?) Pangaea, you can get Holy spells that provide regeneration to manikin/mandragora that works despite their lifelessness. Good fun with a Carrion Dragon :)

Re: a couple of questions about regeneration:
 

I just checked: Ermorian Grand thaumathurgs only have a measly 2 death by default, with a 25% chance of getting one with an extra death dot, and a meager 0,62/l00 chance of getting one with TWO extra death dots.

I suppose this is necessary to avoid making tartarian spams too easy, but it tends to conceal the preserving effect of death dots.

Re: a couple of questions about regeneration:
 

This is the first I've heard that Gift of Health might have been altered to not affect undead. I remember KO discussing that as a possible fix to the Tartarian-spam problem in endgame, but in the end he decided to introduce the Shattered Soul mechanic (non-healable insanity) instead. I haven't used Gift of Health recently though so I don't know its status w/rt undead firsthand.

-Max

Re: a couple of questions about regeneration:
 

Last time I checked, GOH still removed afflictions on lankas demons. One of my favorite tactics.