Hobbling Criticals Feat 18
Source Pathfinder Impossible Magic
Your eidolon's unarmed attacks batter your foes into submission, hampering their movement. Whenever your eidolon gets a critical hit with one of their unarmed Strikes, the target must attempt a fortitude save against your spell DC after taking the damage. This is a critical specialization effect.
Critical Success The target takes no additional effect.
Success The target takes a –10-foot circumstance penalty to its Speeds for 1 round.
Failure The target is Slowed 1 and takes a –10-foot circumstance penalty to its Speeds for 1 round.
Critical Failure The target is Slowed 2 and takes a –15-foot circumstance penalty to its Speeds for 1 round.
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.
EvolutionFeats with this trait affect your eidolon instead of you, typically by granting it additional physical capabilities.
SummonerThis indicates abilities from the Summoner class.