In the baseline ComplexBreeding, some upgrades of tentacle rooms can give essences. But I never managed to get them to work, so I can't say if you can improve the levels of essesences, or just add the first level. The author's description is confusing.there is some mod or cheat that allows to change the essence of the slaves? like the type and numbers
The modpack has a mod that makes ComplexBreeding slightly less complex. One of the changes is that the slaves' essences improve when their depravity reaches maximum, similar to improvements in the base game.
That's all I know.