So I’ve just encountered this and the Alien box which allows you to pick either a red, green or blue serum, has changed a bit.
In the past they upgraded a negative trait you had or gave you the best version of a trait. For example the green serum made your species “Extremely adaptable” or if it was Inadaptive” before made them “Adaptive”.
Now the serums do the following:
Red serum: Trait “Social Pheromones” added; Effect: Pop Housing Usage -5%
Blue serum: Trait “Limited Regeneration” added; Effect: Army Damage +10% and Leader Lifespan +10 years
Green serum: Trait “Bioadaptability” added; Effect: Habitability +5%
Existing negative or positive traits such as “Inadaptive” or “Adaptive” are not touched by this, meaning the new traits will be added to the existing modifiers.
Original Link – Continuation of discussion