Required and Restricted Traits

[Strategia_In_Ultima]

Suicide Junkie said:
If players must choose one from a set of traits, and a race is not viable if none are chosen, then you can do the following:
1) Create a dummy trait that does nothing, and costs -50000
2) Set the cost for all your exclusive traits to +50000

Thus, the players have to choose one and only one.

Same goes if they have to choose more than one; for instance, Adamant has a dummy 30k points trait, and you have to pick a colony type, technological paradigm and social paradigm, costing 10k each. Works like a charm; choose two traits in one category and fail to choose a trait in another, and you're up for serious trouble as you can't do squat