Echoing Spell
Feat 18
Source Pathfinder Player Core 2
You time the components of your spell with exacting precision, setting up a resonance that duplicates the spell's effects. If your next action is to Cast a Spell of 4th rank or lower that has no duration, the spell's energy reverberates and echoes. You can Cast the Spell a second time before the end of your next turn without expending a spell slot.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
SorcererThis indicates abilities from the sorcerer class.
SpellshapeSpellshape actions 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.