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Ki ( Ki?) is spiritual life energy that ninja and other beings use to perform various supernatural effects, including the casting Ninpo or performing more physical techniques.

Classic seriesEdit

Ninja GaidenEdit

In the NES Ninja Gaiden "ki" appeared as Spiritual Strength and was represented with (Shinobu) and a number. Each technique or ninpo equipped costs a set amount of ki. To recover his ki, Ryu Hayabusa must collect spheres marked with 忍, which come in two varieties: blue which recovers 5 and red which recovers 10.

Item 忍 Cost
Throwing Star 3
The Art of the Fire Wheel 5
Windmill Throwing Star 5
Jump & Slash Technique 5

Ninja Gaiden II: The Dark Sword of ChaosEdit


Ninja Gaiden III: The Ancient Ship of DoomEdit


Ninja Gaiden ShadowEdit


Ninja Gaiden XEdit


Modern seriesEdit

Ninja GaidenEdit


Ninja Gaiden: Dragon SwordEdit


Ninja Gaiden IIEdit


Ninja Gaiden 3Edit


Standalone gamesEdit

Game Gear Ninja GaidenEdit


Master System Ninja GaidenEdit


Ninja Gaiden ClansEdit


TriviaEdit

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