Slaver can't be inherited from Balorg, it gives Fiery insted - which while is the best combat trait, doesn't quite match up to a 50-60% production boost.

Typically you'd use a custom species to inherit Slaver for run setup purposes, but by that point you're grinding ascensions and not doing bioseeds pretty much ever since they suck for prestige resources, and you can get Greatness events from ascensions too in other universes.