Vae Weapon Mastery [racial]
KNEEL BEFORE THE SPIDER!
Prerequisites: Int 13, Combat Expertise, Improved Trip, Weapon Focus (spiked chain or whip),Drow Weapon Training, BAB +4.
Benefit: Once per round, when you deal damage to a flatfooted foe (or a foe you flank) with a whip or a spiked chain, you can also initiate a trip attack (as if you had hit with a touch attack). If you fail to trip when using this special attack, your opponent cannot attempt to trip you in turn. You must declare this attempt before you roll your attack, and the attempt is wasted for the round if the attack misses. You must have Weapon Focus with the weapon you are using for this feat. In other words, having Weapon Focus (whip) does not allow you to use the Vae School feat with a spiked chain, or vice versa.