True Shapeshifter
Level 20 Concentrate Druid

Prerequisites: Dragon Shape, Wild Shape

You transcend the limitations of form. While under the effects of wild shape, you can change into any other form on your wild shape list; if the durations of the forms would vary, use the shorter of the two durations.

Once per day, you can transform into a kaiju, with the effects of nature incarnate; if you have Plant Shape, you can instead transform into a green man.