Gorebrute Elite

 
Prerequisite(s): Shifter, Gorebrute Trait
 
Benefit: Any creature that takes damage from your horns during your charge attack must succeed on an opposed Strength check (you gain +2 for charging) or be knocked prone in its space. The defending creature gains a +4 bonus on its check if it has four or more legs or a form with exceptional stability (Dwarf). A creature that cannot be tripped, cannot be knocked down by this feat.
 
Source: Races of Eberron