Racial traits: yes you can mod more in. Don't ask me how but you can.
Culture types: No, as far as I know those are hard coded and cannot be changed.
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Ragnarok -
Hevordian Story Thread
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I think...therefore I am confused.
They were armed. With guns, said Omari.
Canadians. With guns. And a warship. What is this world coming to?
The dreaded derelict dwelling two ton devil bunny!
Every ship can be a minesweeper... Once