Tandem Strike Feat 6
Source Pathfinder Secrets of Magic
Requirements A creature is in your and your eidolon's reach.
You and your eidolon each attack, seamlessly targeting the same foe without interfering with each other's movements. Your eidolon makes a melee Strike, and then you make a melee Strike against the same creature. Both attacks count toward your multiple attack penalty, but the penalty doesn't increase until after both attacks have been made.
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.
SummonerThis indicates abilities from the Summoner class.