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There is a Legacy version here.

PFS StandardReactive Transformation [reaction] Feat 14

Druid 
Source Player Core pg. 134 2.0
Prerequisites Untamed Form; Dragon Shape, Elemental Shape, Plant Shape, or Soaring Shape
Trigger varies

You transform reflexively when in danger. You cast untamed form to transform into one shape granted by one of the prerequisite feats you have, depending on the trigger. Your shape’s resistances and weaknesses apply against the triggering damage.