Critique my Ninja ranged archetype: Hidden Scorpion

[Taason the Black]

Hidden Scorpion

Alignment: Any.

Strong Arm
At 1st level, a hidden scorpion halves all range increment penalties when making ranged attacks with a thrown weapon.

This ability replaces No Trace.

Bullseye (Ex)
A hidden scorpion focuses his ability to deal sneak attack damage with thrown weapons to such a degree that she can deal more sneak attack damage with ranged attacks at the expense of sneak attacks with non-ranged attacks. When he makes a sneak attack with a ranged weapon, he uses d8s to roll sneak attack damage instead of d6s. For sneak attacks with all melee weapons, he uses d4s instead of d6s. This ability is identical in all other ways to sneak attack, and supplements that ability.

Daggered Ace (Ex)
At 4th level, a hidden scorpion increases the range at which he can apply sneak attack damage by 10 feet. This range increases by 10 feet for every 3 levels after 4th.

This ability replaces Uncanny Dodge.

Shroud of Concealment (Ex)
At 6th level, a hidden scorpion is so skilled in combat involving ranged attacks that he gains a +2 dodge bonus to AC against attacks made against her with ranged weapons and spells requiring touch attacks. This bonus increases by +1 for every three levels, to a maximum of +6 at 18th level.

This ability replaces Light Steps.

Fan of Knives (Su)
This ability is usable only when the target of the ability is within 20 feet and has visual line of sight of the hidden scorpion. As a standard action, the hidden scorpion unleashes a blur of blades at ranged of the target. The target must make a Will Save (Phantasmal effect) Dc 10 + 1/2 the ninjas level + cha mod or be effected as being struck by a number of thrown weapons equal to the ninjas effective level. If the will save is successful, the target only takes damage from the single weapon thrown. The hidden scorpion can use Fan of Knives cha mod/day.

This ability replaces Improved Uncanny Dodge.

[+5 Toaster]

throwing specialist, nice! ;)

[Taason the Black]

You take the hit if they get up in your grill but at ranged, its nasty. The concept is more "western style" ninja with throwing daggers but stars work good as well.

[+5 Toaster]

I bet one of players would try this, I know I would.

[Taason the Black]

Critiques? Modifications? Anyone?

[Movin]

I can see issue with the vaugeness of thrown weapon in fan of knives. Thats just fine till you get a ninja fighter multiclass hurling ninja level greatswords at folks. The intent is small weapons, daggers, throwing stars and such. So I would suggest the clarification that fan of knives only working with a light weapon. You likely also want to say if static modifiers like str bonus ,additional damage flaming weapons and sneak attack, or other more esoteric damage increasers work with the fan. Shatter defenses and other fancy techs can flatfoot foes even when they are looking straight at you, as can the spell grease.

Past that I would say the archetype looks just fine all the other abilites fit the thrown weapon flavor,