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The Ninja Spy possesses highly specialized training that, if put to the right use, can lead to ultimate victory, even against an overwhelming force.
Student Kiricletica, a Ninja Spy that began her first life by attempting to complete every adventure she could as a solo adventurer, without any hirelings or party members, devised an attack style that slows and damages many enemies but can also deliver catastrophic damage-over-time to tougher Orange- and Red-Named enemies.
Kiricletica (along with Teacher Saekee) dubbed the technique "Viper Style." The Viper Style is a high-stealth Monk assassin that can bypass high volumes of enemies, reaching places and targets with less fighting.
Viper Style is applied by combining, in order
Viper Style relies on the use of shortswords or kamas to inject Ninja Poison.
While you can perform the Freezing finisher, you cannot use Poisoned Soul or inject Ninja Poison (outside of the Poisoned Darts ability) while fighting unarmed or with quarterstaves. A piercing/slashing weapon is required. (Items and feats that claim such damage, such as Vorpal Strikes, Ivy Wraps, or Brawling Gloves, won't work.)
Likewise, while a shuriken can inject Ninja Poison on critical hits using the Sting of the Ninja ability, it cannot utilize the Freezing finisher nor can it use Ninjutsu abilities.
Many lesser enemies don't survive past the Freezing finisher if a Ninja Spy trains in the No Mercy ability where helpless enemies gain up to 30% more damage from your attacks. Any Sneak Attack bonuses you train also affect Helpless enemies.
Freezing the Lifeblood works on all humanoid creatures (not monstrous types) except Red-Named enemies. This means that lesser but dangerous Orange-Named enemies can be paralyzed and Ninja Poison can be injected at will, killing the mini-boss sometimes before they can ever attack.
Viper Style, as its name implies, suggests a more covert approach appropriate to Ninja Spies, just as a hunting cobra looks for an opportunity to strike its prey in secret and in silence.
If you assess your battle while in stealth, maneuvering yourself behind enemies and out of the line-of sight of others, you may find that some enemies can be struck with the Freezing attack, paralyzing that foe while not alerting others. This may allow you to return to Sneak, charge another Freezing finisher and immobilize as many enemies in that party as you can to isolate any leaders.
Viper Style allows you to add in other attacks.
Weapons that damage CON or Fortitude saves can improve Viper Style's effects. Weapons with untyped poison damage will have their poison damage magnified by the Ninja Poison's poison debuff of 5% per stack (up to 100% vulnerability).
Very few enemies are immune from both poison and negative energy, so note that Viper Style works best on living humanoids (this includes halflings, orcs, gnolls, wildmen and lizardmen). Living enemies with some or total immunity to Viper Style include