Body Check
Prereq.
Power Attack, Improved Bull Rush.
Benefit: On a successful Bull Rush, if you choose to move with your opponent, and the opponent's movement backward is impeded by a wall or solid object, the opponent takes damage from being pinned between your body and the obstruction. The damage is equal to 2d6+ 1 1/2 times your Str. Modifier. The damage increases by 1d6 for each size category you are larger than your opponent.
The opponent is allowed a reflex save to halve the damage.
Special:
The damage values for armor spikes and/or shield spikes are added to this damage.
Shield Hammer
prereq.
Improved Shield Bash, Shield Proficiency, Two Weapon Fighting, Shield Slam
Benefit: On a successful Shield Slam, your opponent is knocked prone and sent backwards.
Normal:
Any opponents hit by your shield bash are also
hit with a free bull rush attack, substituting your attack
roll for the combat maneuver check (see the Combat chapter).
This bull rush does not provoke an attack of opportunity.
Opponents who cannot move back due to a wall or
other surface are knocked prone after moving the maximum
possible distance.
Edited to be more concise.