TC01
Deity
Any tip in which mod's dll to look to know how it's done? I want to do it for myself but I am a newbie DLL digger .
xienwolf has a good introductory tutorial to DLL editing. He talks about how to copy a boolean from one file to another (units to promotions).
That should be what you need to do- copy bDefensiveOnly from CvUnitInfo to CvPromotionInfo. It's a different tag though, so you can't simply follow the tutorial entirely, but it should be a good start.