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There is a Legacy version here.

PFS StandardEnergy Ablation [one-action] Feat 2

Spellshape Wizard 
Source Player Core pg. 201 2.0

As you direct destructive energy at a foe, you can divert some of its power into a protective barrier that shields you from harm. If your next action is to Cast a Spell that deals at least one type of energy damage (acid, cold, electricity, fire, force, sonic, vitality, or void), you gain resistance to an energy damage type of your choice equal to the spell’s rank. The resistance lasts until the end of your next turn. You get the resistance regardless of whether or not your spell dealt damage.

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.