Reference: Galaxy at War (26), Knights of the Old Republic Campaign Guide (33).
Prerequisites: Dexterity 13, Martial Arts I.
Effect: You can double the damage bonus provided by your Strength modifier to unarmed attacks (minimum +1) provided you make only one unarmed attack this turn. Once per encounter when you deal damage to a target with an unarmed attack you may make an immediate unarmed attack against the target's Fortitude Defense as a free action; if successful you knock your opponent to the ground (prone) in their current square, provided they are no more than one size larger than you.
Special: Targets gain a bonus to Fortitude Defense against being knocked prone based on their size: Large +5, Huge +10, Gargantuan +20, Colossal +50. Unusually stable creatures (such as those with four legs) gain a +5 bonus to their Fortitude Defense against being knock prone as well. If you have the Echani Expertise talent, whenever you score a critical hit with an unarmed attack, the target in immediately knocked to the ground (prone) in its current square, provided that the target is no more than one size larger than you.