Treacherous Blade (Ex)
At 7th level, a velvet blade can capitalize on how others underestimate her and allow her close to them, assuming she is harmless. She gains the Betrayer feat as a bonus feat, whether or not she meets the prerequisites. Additionally, when making her first attack against a studied target that believes her to be harmless or to be an ally, the attack counts as a sneak attack, even if the target isn’t flanked or denied its Dexterity bonus to AC, and the velvet blade gains +2d6 sneak attack damage, increasing by 1d6 at 10th level and every 5 levels thereafter. Even if she immediately attacks the target again (such as by continuing a full attack), only the first attack gains these benefits, since the target immediately realizes the velvet blade is something more than she seemed.