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This one is a bit iffy. Had to pretty much sear it into the LECO. It changes mostly background objects from a fantasy to a scifi version. It seem to work lees happily on clothing unless it is armor or something that has a specific futuristic version.
LECOs are manipulated by their weight and normally need no triggers to use it, change their weight like this <lora:SCIFantasy:-1> to make stuff more medieval/fantasy-ish <lora:SCIFantasy:1> to make stuff more futuristic, setting it to zero having very little effect on the prompts. Remember you can go further than -1 or 1!