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PFS StandardTrue Shapeshifter Feat 20

Concentrate Druid 
Source Player Core pg. 135 2.0
Prerequisites Dragon Shape; Untamed Form

You transcend the limitations of form. Once per day you can cast nature incarnate, even if you don’t have it prepared, to transform into a kaiju. If you have Plant Shape, you can choose to transform into a green man instead. You also gain the True Shapeshift activity.

True Shapeshift [two-actions] (concentrate) Requirements You’re under the effects of untamed form; Effect You change into any other shape on your untamed form list. If the duration of that shape is different from the one you were previously in, use the shorter duration to determine your duration remaining.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.