Effortless Concentration Feat 16
Source Pathfinder Advanced Player's Guide
Trigger Your turn begins
You maintain a spell with hardly a thought. You immediately gain the effects of the Sustain a Spell action, allowing you to extend the duration of one of your active class spells.
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.
BardThis indicates abilities from the bard class.
DruidThis indicates abilities from the druid class.
SorcererThis indicates abilities from the sorcerer class.
SummonerThis indicates abilities from the Summoner class.
WitchThis indicates abilities from the witch class.
WizardThis indicates abilities from the wizard class.