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Earth Child Topple (Combat)

Source Ultimate Combat pg. 99
Your mastery of balance and momentum allows you to bring down giants with your bare hands.

Prerequisites: Wis 13, dwarf or gnome, defensive training racial trait, Earth Child Style, Improved Trip, Improved Unarmed Strike, Acrobatics 6 ranks.

Benefit: You can trip a creature of the giant subtype of up to Huge size. While using Earth Child Style, you add your Wisdom bonus on combat maneuver checks made to trip a creature of the giant subtype, as well as on attack rolls to confirm a critical hit against such a creature.

Normal: You can trip only those opponents that are one size category larger than you.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 119
When you trip a creature with the giant subtype, you can spend 3 stamina points to cause the creature to also take 2d6 points of falling damage.