not sure if pet stims work on humanoid pets but if they do they heal mind dammage.
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To Upgrade something implies that you are adding too, enhancing, and fixing the thing that you are upgrading. The CU does not do this, it is not adding too, enhancing, or fixing the combat system that is in place, it is replacing the innovative SWG system with the generic one used by its competitors. Be honest and stop calling it the CU, Call it the CR (combat replacement) instead