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There is a Legacy version here.

PFS StandardEnergy Fusion [one-action] Feat 10

Concentrate Sorcerer Spellshape 
Source Player Core 2 pg. 154

You fuse two spells together, combining their energy types. If the next action you use is to Cast a Spell that deals energy damage, select a non-cantrip spell in your spell repertoire that deals a different type of energy damage, and expend an additional spell slot of the same rank as this secondary spell. The spell you cast deals additional damage equal to the rank of the secondary spell slot expended. The spell's total damage is divided evenly between the energy type of the spell you cast and the energy type of the secondary spell.

Traits

Concentrate:

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

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.