Normally on Sociopath:

You regenerate 10% health on kill with a cooldown of 1 seconds.

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Infiltrator Version: No Infiltrator Heal with Zerk

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This mod makes it so the heal doesnt trigger if you have the beserker skill. (If you dont have berserker, it works as normal)

Allowing you to run higher than 40% zerk and use the melee at the same time.