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As the name implies
You know how you auto heal when hurt?
What is that rate of that?
Health regeneration delay is 6s without tough. It heals for 4hp/s.
Health regen happens automatically. It'll start by itself if you haven't taken any damage 5 or so seconds. 2 if you have the tough perk I believe.
I'm not sure what its rate is though, it seems to start off slowly but increase to around 2 or 3 HP per second?