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PFS StandardExplosive Metamorphosis [one-action] Feat 12

Druid Spellshape 
Source Howl of the Wild pg. 56 2.0

You use additional primal energy to transform, creating a burst of elemental energy to complement your transformation. If your next action is to cast a non-cantrip morph or polymorph spell, select acid, cold, electricity, or fire. Your transformation creates a 5-foot emanation around your new form that deals 1d6 damage of that type per rank of the spell. Each creature in that area attempts a basic Reflex save against your spell DC.

If your polymorph action had a trait corresponding to an energy type, you must select that one if possible. This action gains the trait corresponding to the energy type selected.

Traits

Spellshape:

Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. The benefit is also lost if your turn ends before you cast the spell. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.