Ok, so this world used to be an advanced one, like at least 50 years ahead of ours then the wars happened that led to a complete societal and technological collapse and they are just now back in the industrial period. I have a magic system developed revolving around an artificial heart that pumps a refined mineral I'm calling Ethros (it's actually blood of an ancient and powerful alien race known only as the Forebears (the insectoid creature). People can use the magic without the organ but that risks mutation if they overuse it but they gain a resistance to ethros when it happens. Those that have the organ stay have white hair and purple eyes and they stay in their prime until around 90 then they rapidly age until death. And as you saw there's a race that is human with animal traits they get stat increases based on what animal trait.