In PCGen, Bestiary III has incorrect regeneration values (0 in all cases here) for the gorynych and all members of the oni subtype. In addition, many of the creatures have incorrect means of foiling their regeneration. I have listed the correct ones below.
Gorynych Regeneration 5 (acid)
Oni (Fire Yai) Regeneration 5 (acid or cold)
Oni (Ice Yai) Regeneration 5 (acid or fire) - Only the rate needs to be changed here
Oni (Kuwa) Regeneration 5 (acid or fire)- only the rate needs to be changed here
Oni (Spirit) The Spirit Oni doesn't have regeneration; it only has Fast Healing 2
Oni (Void Yai) Regeneration 15 (Fire or good spells)
Oni (Water Yai) Regeneration 10 (Fire or good spells)
Gorynych regeneration rate still reads 0. (Should be 5)
Kuwa regeneration rate still reads 0. (Should be 5).
Spirit Oni fast healing rate reads 4. (Should be 2). This one is probably my goof; as I had reported the spirit oni as having fast healing 2 in the universal monster ability post, and the fast healing got duplicated here.
PCGen says that "good weapons, good spells" negate the void yai and water yai's regeneration. It should be "fire or good spells".
Fast Healing var was duplicated... and I missed placing vars for those... and copy paste errors.
Completed: At revision: 25531
I'm getting 0 for the gorynych's regeneration and 4 for the spirit oni's fast healing. Everything else looks fixed.
Completed: At revision: 25535