it adds a little bar in the bottom middle part of your screen that as you fill up gives you bonuses for weapons when it is filled, you can charge PAs for the sword that are chargeable in like a second compared to 7 or 8 seconds with a filled sword gear, and the starting PA for the sword that has you do a front-flip strike gets added shockwaves to it when you use it with a full Gear Gauge...
Partisan gear increases the length of attacks so you can hit more enemies
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