Type: Ambush
Source: Dragon #344
When you catch opponents unawares you can unleash a storm of shuriken striking at their most vulnerable points.
Prerequisite: Dex 13, Point Blank Shot, Precise Shot, Rapid Shot, Weapon Focus (shuriken), Acrobatics, sudden strike +4d6.
Benefit: As part of a full-round attack using Rapid Shot, you can throw additional shuriken by reducing your sudden strike damage. You make every attack in the round with a -2 penalty. For each die by which you reduce your sudden strike damage you gain one additional attack and you deal your remaining damage dice to each target struck by the additional attacks gained from this ability. You can sacrifice up to three bonus damage dice to gain three extra attacks in a round. Each target of a shuriken attack must be vulnerable to your sudden strike (i.e., does not currently have a Dexterity bonus to AC), and each shuriken you throw in this way must target a different creature. Other attacks you make as part of your full attack action that are not extra attacks from Rapid Shot or Flurry of Throws do not have to be made with shuriken, and they do not gain bonus sudden strike damage.
For example, a 13th-level ninja uses Rapid Shot and Hurry of Throws to make six attacks (two normal attacks plus one Rapid Shot attack plus three Flurry of Throws attacks). The ninja's attacks have the following base attack bonuses (counting only his base attack bonus and penalties for attacking more than once in around): +6/+1/+6/+6/+6/+6. His three Flurry of Throws attacks deal normal shuriken damage plus 4d6 points of sudden strike damage and must be made against three different foes who lack their Dexterity bonuses to AC and are thus susceptible to sudden strike damage.