What is Ki?
Ki measures two things: each gear has its own ‘Ki’ level, and your character will be given a ‘Total Ki’ level based on the gears equipped (average of all 5 gear).
The higher your Total Ki, the better your damage output and damage resistance. For each Ki level below the maximum (by game difficulty), the less damage you will do and the more damage you will receive. While it is incremental (not a huge difference from one ki to the next ki), it can be significant for certain difficulties and certain attacks.
For all ‘Challenge’ game modes (and Platinum), here is a detailed Ki-by-Ki breakdown of the number of Square Katana Strikes (aka regular attack) to kill a Purple Oni Lord (44-hp bar)
As shown, the higher lvl your Ki is, the less strikes it will take to kill a Purple Oni Lord.
120 Ki
119 Ki
118 Ki
117 Ki
116 Ki
115 Ki
114 Ki
113 Ki
112 Ki
111 Ki
110 Ki
109 Ki
108 Ki
107 Ki
106 Ki
105 Ki
104 Ki
103 Ki
102 Ki
101 Ki
100 Ki
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Ghost of Tsushima: Legends 