Emphasis mine.SRD said:Size and TypeThe creature’s type changes to undead. Do not recalculate base attack bonus, saves, or skill points. Size is unchanged.
Hit Dice
Increase all current and future Hit Dice to d12s.
Emphasis mine.
When something changes, you recalculate unless it explicitly tells you not to. Since HD changed, you recalculate HP. Although I am curious as to what template you'd gain at level 4.
Also, although it's not exactly on topic, if you're doing this, remember to be in a Desecrated area. Also, if someone else is turning you undead, you should try to make sure they're a Dread Necro with the Corpsecrafter line. Just some advice.[/FONT][/COLOR]
What template? The template will tell you what to do. Lich and Vampire will improve your HD, some might not.Quick question guys:
So lets say I am a level human/wizard 4 then gain an undead template would I re-roll my 4d4 HP to 4d12 HP? or would the class HP stay?
The template will tell you if you change your HD, yes. Lich and vampire are already noted, but I'm guessing you're going for Necropolitan? If tht's the case then you do change your HD to d12 as per the rules, and the example necropolitan wizard does indeed have d12 HD despite being a 5th level wizard.
Which is why, at the minimum, a desecration is vital for an undead PC.Note also that your Constitution score changes to " - ". That means you get no Con modifier, positive or negative, to your HP
Good catch, I forgot to mention this.(or to your Fort save, for that matter).