Genocide

[Strategia_In_Ultima]

I sometimes use a race in SP that has ALL extra tech area bonuses , but which accordingly has massive deficits in race characteristics. When you capture a race, in SEIV I do not believe you get the advantages of it - i.e. you cannot build Talismans if you capture a Religious race. And since it is weak anyway, I would simply annihilate it should I come across it myself.

(Or exploit them - trade with them. If they've got a trade deficit and you've got a trade bonus, suck all of their resources out of them with a Trade treaty and then subjugate/conquer them, just for the fun of it.)