[3.5] Question: Nonlethal Immunities.

[Yael]

I can't find any concrete information about which creatures own the nonlethal immunity, can I have some link or help with the listing?

I've read that it's tied with mind-affecting as the top tier immunity (common), but I could use some of that information.

[Zanos]

Are you looking for creature types? The Undead, Deathless and Construct types have immunity to nonlethal damage, in addition to a host of other immunities.

[holywhippet]

www.d20srd.org/srd/typesSubtypes.htm

Looking at that anything that is undead or a construct is immune to non-lethal damage.

[Flickerdart]

I can't find any concrete information about which creatures own the nonlethal immunity, can I have some link or help with the listing?

I've read that it's tied with mind-affecting as the top tier immunity (common), but I could use some of that information.
Non-lethal damage immunity is only top-tier because Regeneration transforms lethal damage into non-lethal (and thus if you are immune to non-lethal damage, you essentially become immune to all damage). However, the easiest ways to get non-lethal damage immunity also involve not having a Constitution score, which makes Regeneration not function.