Awesome Blow

Type of Feat: General
Prerequisite: Power Attack, Knockdown, Strength 25
Use: Selected.

As a standard action, the creature can choose to subtract 4 from its melee attack roll and deliver an awesome blow. If the creature hits a corporeal opponent smaller than itself with an awesome blow, its opponent must succeed on a Reflex save (DC equal to damage dealt) or be knocked flying 10 feet in a direction of the attacking creature's choice and fall prone. The attacking creature can only push the opponent in a straight line, and the opponent can't move closer to the attacking creature than the square it started in. If an obstacle prevents the completion of the opponent's move, the opponent and the obstacle each take 1d6 points of damage, and the opponent stops in the space adjacent to the obstacle.

Gameplay Notes

Bugs

This feat has problems calculating damage and difficulty class, as well as applying the correct attack bonus penalty in various scenarios.

Whether one-handed or two-handed, Improved Power Attack only adds 6 damage (even if the PC has Enhanced Power Attack).
Northlander Hewing does not factor into calculations.
The weapon damage roll seems limited to a maximum of 6, regardless of weapon.
The Attack Bonus penalty when using a weapon two-handed is -7; it should be -4.
If under the effects of an Enlarge Creature spell and attacking two-handed, the feat applies a -12 penalty to hit.

... and so on.