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There is a Legacy version here.

PFS StandardCryptic Spell [one-action] Feat 4

Concentrate Druid Spellshape 
Source Dark Archives (Remastered) pg. 64

Requirements You're in natural terrain.

You hide your magic in the croak of a frog, in the sway of the trees, in the howl of the wind, and the flicker of the will-o'- wisp. If the next action you take is to Cast a Spell, the spell gains the subtle trait, masking the spell's manifestations in the natural sights and sounds of the environment.

The trait hides only the spell's spellcasting actions and manifestations, not its effects, so an observer might still see you transform into a giant bear.

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.