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There is a Legacy version here.

PFS StandardElemental Shape Feat 10

Druid 
Source Player Core pg. 133 2.0
Prerequisites Untamed Form

You understand the fundamental elements of nature such that you can imbue them into your body and manifest as a living embodiment of those elements. Add the shapes in elemental form to your untamed form list. Whenever you're polymorphed into another shape using untamed form, you gain resistance 5 to fire.

Elemental Shape Leads To...

Reactive Transformation