PLEASE help me find this feat

[Level 20 NPC]

Hey guys, someone wrote me a message describing a feat that (if true) would be amazing for a couple builds i have in mind.
Disclaimer: i don't think this feat actually exists because it sounds quite strong, and the person who wrote me is not replying, but still...

"I'm a wyrwood and i have an animal companion. I took that feat that makes spells and other types of abilities have to be able to affect your type (construct) as well as the animal type."

If you know what he's talking about, please help me

[Phoebus Alexandros]

If they’re not replying, it might be an indication that it’s either homebrew, third party material, or doesn’t exist at all.

[Wonderstell]

Animal Soul

"You can choose not to allow spells and effects to effect you if they would not be capable of affecting both your original creature type and the animal creature type."

The archives search function is nifty for situations like these.

Choose "Only return results with all terms" and then "Select none"->"Feats"

"animal creature type" leads you to 8 results, where Animal Soul hides.

[Level 20 NPC]

Thanks Wonderstell!
That feat could be quite strong, honestly.