The update also rebalances relics, improves UI and AI, and brings back Culture Workers.
You might be thinking thats a bit useless if youre a Stellaris vet.
Theres now three options for this: off, Mid-Game or Late-Game.

Late-Game functions the same as the games previous version of difficulty scaling.
Culture workers are also back by popular demand, after a period of absence from the game.
Those effects are doubled for Fanatic Ethics too.

you’re free to see details of what Ethics create what outputshere.
Death chroniclers are considered culture workers now too, as Galactic Memorials are replacing normal Monuments.
Fornax also rebalances relics, changing a lot of active and passive effects.
There are a bunch of other tweaks in the 3.5 Fornax update, mostly UI and AI improvements.
Paradox say theyve been working on making the AI competitive but believable within Stellaris story.
Fornax introduces a whole bunch of performance improvements too.
you’re free to read the full patch notes for 3.5 Fornaxhere.
Stellaris 3.5 Fornax update arrives today, along with the Toxoids species pack.
you’re able to find the base game onSteamandGOG.