Echoing Channel Feat 18
Source Pathfinder Core Rulebook
When you pull forth positive or negative energy, you also create a smaller pocket of that energy.
If the next action you use is to cast a 2-action Harm or Heal to heal or damage a single creature, choose one additional creature adjacent to either you or the target. Target that creature with a 1-action version of the same spell. This spell is the same level as the 2-action harm or heal you cast and doesn't cost another 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.
ClericThis indicates abilities from the cleric class.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
MetamagicActions with the metamagic trait, usually from metamagic feats, tweak the properties of your spells. You must use a metamagic action directly before Casting the Spell you want to alter. If you use any action (including free actions and reactions) other than Cast a Spell directly after, you waste the benefits of the metamagic action. Any additional effects added by a metamagic action are part of the spell's effect, not of the metamagic action itself.