Are these Racial Passives the only way to obtain skills like this? And do they stack on top of all other Stamina/Health Regen caps? I am trying to verify how good these skills actually are before choosing Race

Red diamond looked a bit OP to me but I will have to see it in game.

I saw some vids of imperials attacking with the FTC addon, the red diamond healing seems really, really small. Idk if its even worth it.

It's a percentage of health, so the more health you have, the bigger the heal.

That and apparently I built my mages wrong and I am supposed to actually dump everything into health anyways and that will further boost Red Diamond.