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Invisible Blade (Su): Whenever a ninja uses the vanishing trick ninja trick, she is treated as if she were under the effects of greater invisibility. The ninja must have the vanishing trick ninja trick before selecting this ninja trick.
The creature or object touched becomes invisible. If the recipient is a creature carrying gear, that vanishes, too. If you cast the spell on someone else, neither you nor your allies can see the subject, unless you can normally see invisible things or you employ magic to do so.
Items dropped or put down by an invisible creature become visible; items picked up disappear if tucked into the clothing or pouches worn by the creature. Light, however, never becomes invisible, although a source of light can become so (thus, the effect is that of a light with no visible source). Any part of an item that the subject carries but that extends more than 10 feet from it becomes visible.
Of course, the subject is not magically silenced, and certain other conditions can render the recipient detectable (such as swimming in water or stepping in a puddle). If a check is required, a stationary invisible creature has a +40 bonus on its Stealth checks. This bonus is reduced to +20 if the creature is moving. The spell ends if the subject attacks any creature.
This spell functions like invisibility, except that it doesn't end if the subject attacks.
Assassinate (Ex): A ninja with this master trick can kill foes that are unable to defend themselves. To attempt to assassinate a target, the ninja must first study her target for 1 round as a standard action. On the following round, if the ninja makes a sneak attack against the target and the target is denied its Dexterity bonus to AC, the sneak attack has the additional effect of possibly killing the target. This attempt automatically fails if the target recognizes the ninja as an enemy. If the sneak attack is successful and the target of this attack fails a Fortitude save, it dies. The DC of this save is equal to 10 + 1/2 the ninja's level + the ninja's Charisma modifier. If the save is successful, the target still takes the sneak attack damage as normal, but it is immune to that ninja's assassinate ability for 1 day.
Do they see the ninja to recognize the ninja as an enemy? Depends on the perception check and active spells in area.
They may know their is a enemy in the area but, they don't know who or what they are facing to recognize the pc as an enemy "yet". This is because of greater invisibility. The act of attacking doesn't stop greater invisibility from working. So the orcs in this case have to beat the ninjas "passive" stealth. (stealth skill total + 20/40) Once that is done by any one of the orcs then the assassinate skill can't be used. For the orcs have now recognized the enemy.