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Ah alright. Thank you for clarifying.

@Chosen Mimes
Only spawning can be done (if a mod to do this is made), but deleting cannot.
Playable Guardian was able to do that, though it does not support latest version of Stellaris.

so there is no way of spawning a let's say enigmatic fortress system the way you spawn an l-gate system via mod menu?

@Chosen Mimes
Strength of Levaiathans can be modified by Dynamic Difficulty

About the number and a kind of them, I wish I could, but I have no idea to make such a mod.
You know my mods modify every parameters after galaxy generated, but Levaiathans and their stellar systems are created on galaxy generated. Moreover, there is no way to delete the stellar systems.

could you do a Leviathan manager? a way to control how many, which and how strong leviathans spawn?