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Originally Posted by
AylinIsAwesome
Yes and no...
You become immune to positive energy spells (and repair spells too but that's only notable if you're Warforged). So spells Clerics are healing people with will not affect you at all. So no in that respect.
However, Clerics do get negative energy spells as well, and those will heal you...but I'm not sure how many clerics actually carry those spells. I would guess not many, since they don't work very well as DPS spells, and most Pale Masters are able to handle themselves from my experience. A Favoured Soul also gets access to the spells, but probably doesn't have room to take them. So even though they technically could heal you, they probably can't because of not knowing the spell or not prepping it or something.
Unless you're in a Role-playing group, I don't think anyone will care that you're in undead form.