I've heard that there's a rule that creatures without Con scores (e.g. undead) cannot have the regeneration special ability. I can see why that would be the case (immunity to nonlethal damage makes Regeneration pretty powerful), but I'd like to see a rules citation for it if it exists.
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\$\begingroup\$ I'm still looking for the actual cite, but I'm pretty sure you hit the nail on the head with the "immunity to non-lethal" part. Remember that they can regenerate hp, they just have the simpler fast healing instead of "true" regeneration. Be back with an answer if I can find a 3.5 source... \$\endgroup\$– gatherer818May 20, 2019 at 5:58
1 Answer
It is right there in Regeneration ability description:
[...] A creature must have a Constitution score to have the regeneration ability.
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3\$\begingroup\$ Well, that's heartbreaking. And makes me look moderately foolish ;) \$\endgroup\$– ElliotMay 20, 2019 at 6:54