Trample Feat 16
Source Pathfinder Secrets of Magic
Your eidolon Strides up to double its Speed and can move through the spaces of creatures at least one size smaller, Trampling each creature whose space it enters. It can attempt to Trample the same creature only once in a single Trample.
It deals bludgeoning damage equal to the damage of its secondary attack against these creatures, which can attempt a basic Reflex save against your spell DC.
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.
EidolonA creature with this trait is a summoner's eidolon. An item with this trait can be worn by an eidolon. An eidolon can have up to two items invested.
SummonerThis indicates abilities from the Summoner class.